Document:

Exhibit 4.4

THE SECURITIES  REPRESENTED BY THIS UNIT PURCHASE  OPTION HAVE BEEN ACQUIRED FOR
INVESTMENT  AND HAVE NOT BEEN  REGISTERED  UNDER THE  SECURITIES ACT OF 1933, AS
AMENDED ("1933 ACT") OR ANY STATE  SECURITIES  LAWS.  SUCH SECURITIES MAY NOT BE
SOLD  OR  TRANSFERRED  IN THE  ABSENCE  OF  SUCH  REGISTRATION  OR AN  EXEMPTION
THEREFROM UNDER THE 1933 ACT AND ANY APPLICABLE STATE SECURITIES LAWS.

                   UNIT PURCHASE OPTION TO PURCHASE UNITS OF
                               NANOSENSORS, INC.
                 (VOID AFTER EXPIRATION DATE - APRIL 30, 2009)

      This certifies that Meyers  Associates,  L.P. or its successors or assigns
("HOLDER")  in  consideration  of one-tenth of one cent ($.001) in hand paid for
each Unit (the "Unit") of securities exercised  hereunder,  shall be entitled to
purchase from NanoSensors,  Inc., a Nevada corporation  ("Company"),  having its
principal place of business at 1800 Wyatt Drive, Suite 2, Santa Clara, CA 95054,
up to 1,375,000 Units of the Company at an exercise price per Unit equal to $.20
("EXERCISE  PRICE").  Each Unit consists of one share of common stock, par value
$.001 (the "Common  Stock") and one  five-year  warrant to purchase one share of
Common Stock at an exercise price of $.30 per share.

      This Unit Purchase Option shall be exchangeable for shares and warrants at
any time, or from  time-to-time,  up to and including 5:00 p.m.  (local time) on
April 30,  2009  ("EXPIRATION  DATE") upon the  surrender  to the Company at its
principal place of business (or at such other location as the Company may advise
the Holder in writing) of this Unit  Purchase  Option  properly  endorsed with a
form of  subscription in  substantially  the form attached hereto duly filled in
and signed and, if applicable,  upon payment of the aggregate Exercise Price for
the  number of shares  for which this Unit  Purchase  Option is being  exercised
determined in accordance  with the provisions  hereof.  Payment of the aggregate
Exercise  Price  may  be  made  as  elected  by  Holder  as  follows  (or by any
combination of the following): (i) in United States currency by cash or delivery
of a certified check, bank draft or postal or express money order payable to the
order of the Company; or (ii) by surrender of a number of shares of Common Stock
held by the Holder equal to the quotient  obtained by dividing (A) the aggregate
Exercise Price payable with respect to the portion of this Unit Purchase  Option
then being  exercised  by (B) the closing bid price per share of Common Stock on
the date of  exercise,  The  Exercise  Price and the  number of shares of Common
Stock  purchasable  hereunder are subject to adjustment as provided in Section 2
of this Unit Purchase Option.

      1. EXERCISE; ISSUANCE OF CERTIFICATES; PAYMENT FOR UNITS.

            1.1 General. This Unit Purchase Option is exercisable in full, or in
      part for 5,000 or more Units, at the option of the Holder of record at any
      time or from  time,  to  time,  up to the  Expiration  Date for all of the
      shares of Common  Stock (but not for a fraction  of a share) and  Warrants
      which may be purchased hereunder. In the case of the exercise of less than
      all of the Unit Purchase  Options  represented  hereby,  the Company shall

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      cancel this Unit Purchase Option Certificate upon the surrender hereof and
      shall execute and deliver a new Unit Purchase  Option  Certificate or Unit
      Purchase  Option  Certificates  of like tenor for the balance of such Unit
      Purchase  Option.  The Company agrees that the units  purchased under this
      Unit  Purchase  Option  shall be and are deemed to be issued to the Holder
      hereof as the record  owner of such units as of the close of  business  on
      the date on which this Unit Purchase  Option shall have been  surrendered,
      properly  endorsed,  the completed,  executed  Subscription Form (attached
      hereto  as  Exhibit  A-1)  delivered  and  payment  made for  such  units.
      Certificates  for the shares of Common  Stock and  Warrants so  purchased,
      together  with any other  securities  or  property  to which the Holder is
      entitled  upon such  exercise,  shall be  delivered  to the  Holder by the
      Company at the Company's expense within a reasonable time after the rights
      represented  by this Unit Purchase  Option have been so exercised,  and in
      any event,  within seven (7) days of such exercise.  Each Common Stock and
      Warrant  certificate so delivered shall be in such  denominations of 5,000
      or more  shares as may be  requested  by the  Holder  hereof  and shall be
      registered on the Company's books in the name designated by such Holder.

            1.2 Shares To Be Fully  Paid;  Reservation  Of Shares.  The  Company
      covenants  and agrees that all shares of Common  Stock which may be issued
      upon the exercise of the rights  represented by this Unit Purchase  Option
      will, upon issuance,  be duly authorized,  validly issued,  fully paid and
      nonassessable  and free from all preemptive  rights of any shareholder and
      free of all taxes,  liens and charges with  respect to the issue  thereof.
      The Company  further  covenants and agrees that,  during the period within
      which  the  rights  represented  by  this  Unit  Purchase  Option  may  be
      exercised, the Company will at all times have authorized and reserved, for
      the purpose of issue or transfer upon exercise of the subscription  rights
      evidenced by this Unit Purchase Option,  a sufficient  number of shares of
      authorized but unissued Common Stock,  when and as required to provide for
      the exercise of the rights  represented by this Unit Purchase Option.  The
      Company  will take all such action as may be necessary to assure that such
      shares of Common Stock may be issued as provided herein without  violation
      of  any  applicable  law or  regulation,  or of  any  requirements  of any
      domestic  securities  exchange  upon  which  the  Common  Stock  or  other
      securities may be listed; provided, however, that the Company shall not be
      required to effect a registration  under federal or state  securities laws
      with respect to such exercise.  The Company will not take any action which
      would  result in any  adjustment  of the  Exercise  Price (as set forth in
      Section 2 hereof) if the total number of shares of Common  Stock  issuable
      after such action upon exercise of all outstanding warrants, together with
      all shares of Common Stock then outstanding and all shares of Common Stock
      then issuable upon exercise of all options and upon the  conversion of all
      convertible securities then outstanding,  would exceed the total number of
      shares  of  Common  Stock or  Equity  Securities  then  authorized  by the
      Company's  Articles/Certificate  of Incorporation  ("Company Charter").

      2.  DETERMINATION OR ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF UNITS. The
Exercise  Price and the number of units  purchasable  upon the  exercise of this
Unit Purchase  Option shall be subject to adjustment  from time to time upon the
occurrence of certain events  described in this Section 2. Upon each  adjustment
of the Exercise Price,  the Holder of this Unit Purchase Option shall thereafter
be entitled to purchase,  at the Exercise Price resulting from such  adjustment,

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the  number  of units  obtained  by  multiplying  the  Exercise  Price in effect
immediately prior to such adjustment by the number of units purchasable pursuant
hereto immediately prior to such adjustment, and dividing the product thereof by
the Exercise Price resulting from such adjustment.

            2.1  Subdivision or Combination of Common Stock. In case the Company
      shall at any time subdivide its outstanding  shares of Common Stock into a
      greater number of shares,  the Exercise Price in effect  immediately prior
      to such subdivision shall be proportionately  reduced, and conversely,  in
      case the  outstanding  shares  of  Common  Stock of the  Company  shall be
      combined  into a smaller  number of shares,  the Exercise  Price in effect
      immediately prior to such combination shall be proportionately increased.

            2.2   Dividends   in   Common   Stock,   Other   Stock,    Property,
      Reclassification.  If at any  time or from  time to time  the  holders  of
      Common  Stock or Warrants (or any shares of stock or other  securities  at
      the time receivable upon the exercise of this Unit Purchase Option or into
      which such  securities  are  convertible)  shall have  received  or become
      entitled to receive, without payment therefore.

            2.2.1 Stock, Common Stock or any shares of stock or other securities
                  which are at any time directly or indirectly  convertible into
                  or exchangeable  for Common Stock, or any rights or options to
                  subscribe  for,  purchase  or  otherwise  acquire  any  of the
                  foregoing by way of dividend or other distribution,

            2.2.2 Any cash paid or payable otherwise than as a cash dividend, or

            2.2.3 Stock, Common Stock or additional stock or other securities or
                  property  (including  cash)  by  way  of  spinoff,   split-up,
                  reclassification,  combination of shares or similar  corporate
                  rearrangement,  (other than shares of Common Stock issued as a
                  stock  split or  adjustments  in  respect  of  which  shall be
                  covered by the terms of Section 2.1  above),  then and in each
                  such case, the Holder hereof shall,  upon the exercise of this
                  Unit Purchase Option,  be entitled to receive,  in addition to
                  the  number  of shares  of Stock or  Common  Stock  receivable
                  thereupon, and without payment of any additional consideration
                  therefor,  the  amount  of  stock  and  other  securities  and
                  property  (including  cash in the cases  referred to in clause
                  (2.2.2) above and this clause (2.2.3)) which such Holder would
                  hold on the date of such  exercise  had he been the  holder of
                  record of such Common Stock as of the date on which holders of
                  Common  Stock  received  or became  entitled  to receive  such
                  shares or all other  additional stock and other securities and
                  property.

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            2.3 Reorganization, Reclassification, Consolidation, Merger or Sale.
      If any recapitalization, reclassification or reorganization of the capital
      stock of the Company,  or any  consolidation or merger of the Company with
      another corporation, or the sale of all or substantially all of its assets
      or other  transaction  shall be  effected  in such a way that  holders  of
      Common  Stock  shall be entitled to receive  stock,  securities,  or other
      assets or property (an  "Organic  Change"),  then,  as a condition of such
      Organic  Change,  lawful  and  adequate  provisions  shall  be made by the
      Company whereby the Holder hereof shall  thereafter  have the right,  upon
      exercise of this Unit Purchase Option, to purchase and receive (in lieu of
      the  units  of  the  Company  immediately   theretofore   purchasable  and
      receivable  upon the  exercise  of the  rights  represented  by this  Unit
      Purchase  Option)  such  shares of stock,  securities  or other  assets or
      property as may be issued or payable  with respect to or in exchange for a
      number of  outstanding  shares of such Common Stock equal to the number of
      units immediately theretofore purchasable and receivable upon the exercise
      of the rights  represented by this Unit Purchase  Option.  In the event of
      any Organic  Change,  appropriate  provision  shall be made by the Company
      with  respect  to the  rights  and  interests  of the  Holder of this Unit
      Purchase Option to the end that the provisions hereof (including,  without
      limitation,  provisions  for  adjustments of the Exercise Price and of the
      number of shares purchasable and receivable upon the exercise of this Unit
      Purchase Option) shall thereafter be applicable, in relation to any shares
      of stock,  securities or assets  thereafter  deliverable upon the exercise
      hereof. The Company will not effect any such consolidation, merger or sale
      unless, prior to the consummation  thereof, the successor  corporation (if
      other  than  the  Company)   resulting  from  such  consolidation  or  the
      corporation  purchasing  such assets  shall  assume by written  instrument
      executed and mailed or delivered to the  registered  Holder  hereof at the
      last address of such Holder  appearing  on the books of the  Company,  the
      obligation to deliver to such Holder,  upon Holder's exercise of this Unit
      Purchase  Option and payment of the purchase price in accordance  with the
      terms hereof, such shares of stock, securities or assets as, in accordance
      with the foregoing provisions, such Holder may be entitled to purchase.

            2.4

            2.4.1 Except as hereinafter provided, if and whenever after the date
                  of execution of this Unit Purchase  Option,  the Company shall
                  issue  or  sell  any  shares  of  its   Common   Stock  for  a
                  consideration  per Share less than the Exercise Price per Unit
                  hereunder  in  effect  immediately  prior  to the time of such
                  issue or sale,  then forthwith the exercise price of this Unit
                  Purchase  Option shall be reduced to the price  (calculated to
                  the nearest  cent) which the Company  received upon such issue
                  or sale.

            2.4.2 Notwithstanding anything herein to the contrary, no adjustment
                  of the  Exercise  Price shall be made upon (i) the sale by the
                  Company of any shares of Common Stock pursuant to the exercise
                  of  any  options  or  warrants  and/or   conversion  of  notes
                  previously  issued and  outstanding on the date hereof or (ii)
                  issuable under any shareholder approved stock option plan.

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            2.4.3 No adjustment of the exercise price, however, shall be made in
                  an  amount  less  than  $.02 per  Share,  but any such  lesser
                  adjustment  shall be carried  forward and shall be made at the
                  time and together with the next  subsequent  adjustment  which
                  together with any  adjustments so carried forward shall amount
                  to $.02 per Share or more.

            2.5 Certain Events. If any change in the outstanding Common Stock of
      the Company or any other event occurs as to which the other  provisions of
      this Section 2 are not strictly applicable or if strictly applicable would
      not fairly protect the purchase  rights of the Holder of the Unit Purchase
      Option in accordance with such provisions,  then the Board of Directors of
      the  Company  shall make an  adjustment  in the number and class of shares
      available  under  the Unit  Purchase  Option,  the  Exercise  Price or the
      application of such  provisions,  so as to protect such purchase rights as
      aforesaid.  The  adjustment  shall be such as will give the  Holder of the
      Unit Purchase  Option upon exercise for the same aggregate  Exercise Price
      the total number,  class and kind of shares as he would have owned had the
      Unit  Purchase  Option  been  exercised  prior  to the  event  and  had he
      continued to hold such shares until after the event requiring adjustment.

            2.6   Notices of Change.

            2.6.1 Upon any determination or adjustment in the number or class of
                  shares  subject  to  this  Unit  Purchase  Option  and  of the
                  Exercise Price,  the Company shall give written notice thereof
                  to  the  Holder,   setting  forth  in  reasonable  detail  and
                  certifying   the   calculation   of  such   determination   or
                  adjustment.

            2.6.2 The Company  shall give written  notice to the Holder at least
                  10 business days prior to the date on which the Company closes
                  its books or takes a record for determining  rights to receive
                  any dividends or distributions.

            2.6.3 The Company  shall also give  written  notice to the Holder at
                  least 20 days  prior to the  date on which an  Organic  Change
                  shall take place.

      3. ISSUE TAX. The issuance of certificates  for shares of Common Stock and
Warrants  upon the  exercise of the Unit  Purchase  Option shall be made without
charge to the Holder of the Unit  Purchase  Option for any issue tax (other than
any applicable  income taxes) in respect thereof;  provided,  however,  that the
Company  shall not be required to pay any tax which may be payable in respect of
any transfer  involved in the issuance and delivery of any certificate in a name
other than that of the then Holder of the Unit Purchase Option being exercised.

      4. CLOSING OF BOOKS.  The Company will at no time close its transfer books
against the transfer of any warrant or of any shares of stock issued or issuable
upon the exercise of any warrant in any manner which  interferes with the timely
exercise of this Unit Purchase Option.

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      5.  NO  VOTING  OR  DIVIDEND  RIGHTS;  LIMITATION  OF  LIABILITY.  Nothing
contained in this Unit Purchase Option shall be construed as conferring upon the
Holder hereof the right to vote as a shareholder of the Company. No dividends or
interest  shall be payable or accrued in respect of this Unit  Purchase  Option,
the interest represented hereby, or the shares purchasable  hereunder until, and
only to the extent that,  this Unit Purchase  Option shall have been  exercised.
The  Holder of this Unit  Purchase  Option  shall  receive  all  notices as if a
shareholder of the Company.  No provisions hereof, in the absence of affirmative
action by the Holder to purchase shares of Common Stock, and no mere enumeration
herein of the rights or privileges of the Holder hereof,  shall give rise to any
liability  of such  Holder for the  Exercise  Price or as a  shareholder  of the
Company, whether such liability is asserted by the Company or by its creditors.

      6. RIGHTS AND OBLIGATIONS  SURVIVE EXERCISE OF UNIT PURCHASE  OPTION.  The
rights and  obligations  of the  Company,  of the  Holder of this Unit  Purchase
Option  and of the holder of shares of Common  Stock and  Warrants  issued  upon
exercise of this Unit Purchase  Option,  shall survive the exercise of this Unit
Purchase Option.

      7. FURTHER REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY.

            7.1  Articles and Bylaws.  The Company has made  available to Holder
      true,  complete and correct copies of the Company  Charter and Bylaws,  as
      amended, through the date hereof.

            7.2 Due Authority. The execution and delivery by the Company of this
      Unit Purchase Option and the performance of all obligations of the Company
      hereunder,  including  the  issuance to Holder of the right to acquire the
      shares of Common  Stock and  Warrants,  have been duly  authorized  by all
      necessary  corporate  action  on the  part of the  Company,  and the  Unit
      Purchase Option is not inconsistent with the Company Charter or Bylaws and
      constitutes  a  legal,   valid  and  binding  agreement  of  the  Company,
      enforceable in accordance with its terms.

            7.3 Consents  and  Approvals.  No consent or approval of,  giving of
      notice to,  registration with, or taking of any other action in respect of
      any state,  federal or other governmental  authority or agency is required
      with respect to the execution,  delivery and performance by the Company of
      its  obligations  under this Unit Purchase  Option,  except for any filing
      required by applicable  federal and state  securities  laws,  which filing
      will be effective by the time required thereby.

            7.4 Issued Securities.  All issued and outstanding shares of capital
      stock of the Company have been duly  authorized and validly issued and are
      fully paid and nonassessable. All outstanding shares of capital stock were
      issued in full compliance with all federal and state securities laws.

            7.5 Exempt  Transaction.  Subject  to the  accuracy  of the  Holders
      representations in Section 8 hereof, the issuance of the Common Stock upon
      exercise of this Unit Purchase Option will constitute a transaction exempt
      from (i) the registration  requirements of Section 5 of the Securities Act
      of 1933, as amended  ("1933 Act"),  in reliance upon Section 4(2) thereof,
      or upon  the  applicable  exemption  under  Regulation  D,  and  (ii)  the
      qualification requirements of the applicable state securities laws.

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            7.6 Compliance  with Rule 144. At the written request of the Holder,
      who proposes to sell Common Stock  issuable  upon the exercise of the Unit
      Purchase  Option in compliance with Rule 144 promulgated by the Securities
      and Exchange Commission,  the Company shall furnish to the Holder,  within
      five  (5)  days  after  receipt  of  such  request,  a  written  statement
      confirming the Company's  compliance  with the filing  requirements of the
      Securities and Exchange Commission as set forth in such Rule, as such Rule
      may be amended  from time to time and an opinion of counsel  allowing  the
      sale pursuant to Rule 144.

            7.7  Registration.  The shares of Common Stock  underlying this Unit
      Purchase Option are subject to a Registration Rights Agreement dated as of
      the date hereof between the Company and the Holder, the terms of which are
      incorporated by reference herein.

8. REPRESENTATIONS AND COVENANTS OF THE HOLDER.

      8.1 This Unit  Purchase  Option has been  entered  into by the  Company in
reliance upon the following representations and covenants of the Holder:

            8.1.1 Investment  Purpose.  The Unit  Purchase  Option or the Common
                  Stock and Warrants issuable upon exercise of the Unit Purchase
                  Option will be acquired for  investment and not with a view to
                  the sale or distribution  of any part thereof,  and the Holder
                  has no present  intention of selling or engaging in any public
                  distribution  of the same except pursuant to a registration or
                  exemption.

            8.1.2 Private  Issue.  The  Holder  understands  (i)  that  the Unit
                  Purchase  Option and the Common  Stock and  Warrants  issuable
                  upon exercise of this Unit Purchase  Option are not registered
                  under  the  1933  Act  or  qualified  under  applicable  state
                  securities  laws on the ground that the issuance  contemplated
                  by  this  Unit  Purchase   Option  will  be  exempt  from  the
                  registration and qualifications requirements thereof, and (ii)
                  that the Company's reliance on such exemption is predicated on
                  the representations set forth in this Section 8.

            8.1.3 Disposition  of  Holders  Rights.  In no event will the Holder
                  make a disposition  of the Unit Purchase  Option or the Common
                  Stock and Warrants issuable upon exercise of the Unit Purchase
                  Option unless and until (i) it shall have notified the Company
                  of the  proposed  disposition,  and (ii) if  requested  by the
                  Company,  it shall have  furnished the Company with an opinion

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                  of  counsel  (which  counsel  may  either be inside or outside
                  counsel to the  Holder)  satisfactory  to the  Company and its
                  counsel to the effect that (A)  appropriate  action  necessary
                  for  compliance  with the 1933 Act has been  taken,  or (B) an
                  exemption from the  registration  requirements of the 1933 Act
                  is available.  Notwithstanding the foregoing, the restrictions
                  imposed  upon  the  transferability  of any of its  rights  to
                  acquire  Common Stock  issuable on the exercise of such rights
                  do not apply to transfers from the beneficial  owner of any of
                  the  aforementioned  securities  to its  nominee  or from such
                  nominee to its beneficial owner, and shall terminate as to any
                  particular  share of stock when (1) such  security  shall have
                  been effectively registered under the 1933 Act and sold by the
                  Holder  thereof in accordance  with such  registration  or (2)
                  such  security  shall have been sold without  registration  in
                  compliance  with Rule 144 under the 1933 Act,  or (3) a letter
                  shall  have been  issued to the  Holder at its  request by the
                  staff of the  Securities  and Exchange  Commission or a ruling
                  shall have been  issued to the  Holder at its  request by such
                  Commission stating that no action shall be recommended by such
                  staff or taken by such Commission, as the case may be, if such
                  security is transferred  without  registration  under the 1933
                  Act in accordance with the conditions set forth in such letter
                  or  ruling  and  such  letter  or  ruling  specifies  that  no
                  subsequent restrictions on transfer are required. Whenever the
                  restrictions imposed hereunder shall terminate, as hereinabove
                  provided,  the  Holder  or  holder  of a share of  stock  then
                  outstanding  as to which  such  restrictions  have  terminated
                  shall be entitled to receive from the Company, without expense
                  to such  Holder,  one or more  new  certificates  for the Unit
                  Purchase  Option or for such  shares of stock not  bearing any
                  restrictive legend.

            8.1.4 Financial  Risk.  The Holder has such knowledge and experience
                  in  financial  and  business  matters  as  to  be  capable  of
                  evaluating the merits and risks of its investment, and has the
                  ability to bear the economic risks of its investment.

            8.1.5 Risk of No  Registration.  The Holder  understands that if the
                  Company does not file reports  pursuant to Section  15(d),  of
                  the  Securities  Exchange  Act of 1934 ("1934  ACT"),  or if a
                  registration  statement covering the securities under the 1933
                  Act is not in  effect  when it  desires  to sell  (i) the Unit
                  Purchase  Option,  or (ii)  the  Common  Stock  issuable  upon
                  exercise of the Unit  Purchase  Option,  it may be required to
                  hold such securities for an indefinite period. The Holder also
                  understands  that any sale of the Unit Purchase Options or the
                  Common Stock and Warrants  issuable  upon exercise of the Unit
                  Purchase  Option  which might be made by it in  reliance  upon
                  Rule 144  under  the 1933 Act may be made  only in  accordance
                  with the terms and conditions of that Rule.

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            8.1.6 Restriction   on  Exercise  by  The  Holder.   Notwithstanding
                  anything herein to the contrary,  in no event shall any Holder
                  be  required  to exercise  this Unit  Purchase  Option if as a
                  result  of such  exercise  the  aggregate  number of shares of
                  Common  Stock  beneficially  owned  by  such  Holder  and  its
                  Affiliates would exceed 4.99% of the outstanding shares of the
                  Common Stock  following  such  exercise.  For purposes of this
                  Section  8.1.7,  beneficial  ownership  shall be calculated in
                  accordance  with Section 13(d) of the Securities  Exchange Act
                  of 1934, as amended.

      9.  MODIFICATION  AND WAIVER.  This Unit Purchase Option and any provision
hereof may be changed, waived, discharged or terminated only by an instrument in
writing signed by the party against which enforcement of the same is sought.

      10. NOTICES.  Any notice,  request or other document required or permitted
to be given or delivered to the Holder  hereof or the Company shall be delivered
or shall be sent by certified  mail,  postage  prepaid or such other means which
evidences  receipt,  to each such Holder at its address as shown on the books of
the  Company or to the Company at the  address  indicated  therefor in the first
paragraph of this Unit Purchase  Option or such other address as either may from
time to time provide to the other.

      11. BINDING EFFECT ON SUCCESSORS.  As provided in Section 2.3 above,  this
Unit  Purchase  Option  shall be binding  upon any  corporation  succeeding  the
Company by merger,  consolidation or acquisition of all or substantially  all of
the Company's  assets.  All of the  obligations  of the Company  relating to the
Common  Stock and  Warrants  issuable  upon the  exercise of this Unit  Purchase
Option shall survive the exercise and termination of this Unit Purchase  Option.
All of the covenants and agreements of the Company shall inure to the benefit of
the successors and assigns of the Holder hereof.

      12.  DESCRIPTIVE  HEADINGS AND GOVERNING LAW. The description  headings of
the several  sections and  paragraphs of this Unit Purchase  Option are inserted
for convenience  only and do not constitute a part of this Unit Purchase Option.
This Unit Purchase  Option shall be construed  and enforced in accordance  with,
and the  rights of the  parties  shall be  governed  by the laws of the State of
Nevada.

      13. LOST UNIT PURCHASE OPTIONS. The Company represents and warrants to the
Holder  hereof that upon  receipt of  evidence  reasonably  satisfactory  to the
Company of the loss,  theft,  destruction,  or  mutilation of this Unit Purchase
Option and, in the case of any such loss, theft or destruction,  upon receipt of
an indemnity reasonably  satisfactory to the Company, or in the case of any such
mutilation  upon surrender and  cancellation of such Unit Purchase  Option,  the
Company,  at its expense,  will make and deliver a new Unit Purchase Option,  of
like tenor,  in lieu of the lost,  stolen,  destroyed or mutilated Unit Purchase
Option.

      14. FRACTIONAL  SHARES. No fractional shares shall be issued upon exercise
of this  Unit  Purchase  Option.  The  Company  shall,  in lieu of  issuing  any
fractional  share,  pay the Holder entitled to such fraction a sum in cash equal
to such fraction multiplied by the then effective Exercise Price.

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      IN WITNESS WHEREOF, the Company has caused this Unit Purchase Option to be
duly executed by its officers,  thereunto duly authorized this 26th day of April
2004.

                                    NANOSENSORS, INC.,
                                    A Nevada corporation

                                    By:
                                       -----------------------------------------
                                        Name: Ted L. Wong
                                        Title: President & CEO

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                                  EXHIBIT A-1

                               SUBSCRIPTION FORM

Date: _________________, _______

NanoSensors, Inc. - Attn: President

Ladies and Gentlemen:

      The undersigned  hereby elects to exercise the Unit Purchase Option issued
to it by NanoSensors, Inc. ("COMPANY") and dated April 26, 2004, ("UNIT PURCHASE
OPTION") and to purchase thereunder __________________________________ shares of
the  Common   Stock  of  the  Company   ("SHARES")   at  a  purchase   price  of
________________   ($______)  per  Share  or  an  aggregate  purchase  price  of
__________________ ________________ Dollars ($__________) ("EXERCISE PRICE").

Pursuant to the terms of the Unit Purchase Option, the undersigned has delivered
the Exercise Price herewith in a manner set forth in the Unit Purchase Option.

                                   Very truly yours,

<PAGE>

                                   ASSIGNMENT

                   To Be Executed by the Registered Holder
                   in Order to Assign Unit Purchase Options

FOR VALUE RECEIVED,

______________________________________________________ hereby sells, assigns and
transfers unto

           PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

                     --------------------------------------

                     --------------------------------------

                     --------------------------------------
                    [please print or type name and address]

_____________________of  the Unit  Purchase  Options  represented  by this  Unit
Purchase Option  Certificate,  and hereby  irrevocably  constitutes and appoints
____________________________________  Attorney  to transfer  this Unit  Purchase
Option Certificate on the books of the Company,  with full power of substitution
in the premises.

Dated: ________________________            x ________________________
                                                Signature Guaranteed

THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION  FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS UNIT PURCHASE OPTION  CERTIFICATE IN EVERY
PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER, AND MUST
BE  GUARANTEED  BY A  COMMERCIAL  BANK OR TRUST  COMPANY OR A MEMBER FIRM OF THE
AMERICAN  STOCK  EXCHANGE,  NEW YORK STOCK  EXCHANGE,  PACIFIC STOCK EXCHANGE OR
MIDWEST STOCK EXCHANGE.Exhibit 10.1

                                NANOSENSORS, INC.

                            PLACEMENT AGENT AGREEMENT

                                                      Dated as of April 20, 2004

Meyers Associates, L.P.
45 Broadway
2nd Floor
New York, New York 10006

Gentlemen:

         NanoSensors,  Inc.  (the  "Company")  proposes  to offer  for sale (the
"Offering") in a private offering pursuant to Section 4(2) of the Securities Act
of 1933,  as  amended  (the  "Act"),  and/or  Regulation  D  promulgated  by the
Securities and Exchange Commission thereunder,  up to 2,750,000 Units, each unit
consisting of one (1) share of Common Stock,  $.001 par value ("Shares"),  and a
Common Stock Purchase  Warrant to purchase one (1) share of Common Stock at $.30
per  share  ("Warrant").  The Units are  being  offered  at $.20 per Unit,  (the
"Units") for an  aggregate  of  $550,000.  The Offering is being made on a "best
efforts" basis. Offers and sales of the Units shall be made solely to Accredited
Investors  (as  defined  in  Regulation  D.) This  document  shall  confirm  our
agreement concerning Meyers Associates, L.P., acting as the placement agent (the
"Placement Agent" or "Meyers")) in connection with the sale of the Units.

         The Company  has  prepared  Offering  Documents  dated April 21,  2004,
relating  to,  among other  things,  the  Company,  the Units,  the terms of the
Offering and the terms of sale of the Units. The Offering  Documents,  including
all  supplements,  exhibits  and  appendices  thereto  and  documents  delivered
therewith,  are referred to herein as the "Offering Documents" and shall include
any supplements or amendments in accordance with this Agreement.

         l. Appointment of Placement Agent.

         On the basis of the  representations  and warranties  contained herein,
and subject to the terms and  conditions  set forth herein,  the Company  hereby
appoints  Meyers  Associates,  L.P., as the Placement Agent and grants to Meyers
the exclusive right to offer,  as its agent,  the Units pursuant to the terms of
this Agreement. On the basis of such representations and warranties, and subject
to such conditions,  Meyers hereby accepts such appointment and agree to use its
reasonable  best  efforts  to  secure   subscriptions  for  Units.  The  Company
understands  that the Placement Agent is being retained to obtain  subscriptions
on a "best efforts" basis and has not guaranteed the sale of any Units.

         2. Terms of the Offering.

            (a) The  Offering  shall  consist  of up to  2,750,000  Units,  at a
purchase  price of $.20 per Unit. The Offering is being made on a "best efforts"
basis. In the event a subscription is not accepted,  such rejected  subscription
funds will be returned to the subscriber without interest or deduction.

                                       1
<PAGE>

            (b) The Offering will commence on or about April 21, 2004, and shall
expire at 5:00 p.m.,  New York time,  on May 20,  2004  unless  extended  by the
Placement  Agent  for an  additional  30 days.  Such  period,  as same may be so
extended, shall hereinafter be referred to as the "Offering Period."

            (c) Each prospective investor  ("Prospective  Investor") who desires
to purchase  Units shall deliver to the  Placement  Agent,  or its designee,  an
executed  Subscription  Agreement and its check in available funds in the amount
necessary to purchase the number of Units such  Prospective  Investor desires to
purchase.  The Prospective Investor shall also complete such other documents and
questionnaires  annexed to the Offering  Documents (the "Ancillary  Documents").
The Placement  Agent shall not have any obligation to  independently  verify the
accuracy  or  completeness  of  any  information  contained  in  a  Subscription
Agreement  or the  Ancillary  Documents  or the  authenticity,  sufficiency,  or
validity  of any check  delivered  by any  Prospective  Investor  in payment for
Units.

         3. Delivery of Documents; Closings.

            (a) All executed  Subscription  Agreements  and Ancillary  Documents
along with all checks in payment for each subscription shall be delivered to the
Placement Agent at 45 Broadway,  2nd Floor, New York, New York 10006. All checks
should be made  payable  to  "Goldstein  &  DiGioia,  LLP,  Escrow  Account  for
NanoSensors,  Inc." All funds deposited in the escrow account, shall be remitted
to the  Company  if the  subscription  is  accepted  or to the  Investor  if the
subscription  is  rejected  subject  to the  conditions  of this  Section 3. The
Subscription  Agreement  and all Ancillary  Documents  shall be forwarded to the
Company promptly for acceptance or rejection.

            (b) During the Offering  Period,  funds  representing  subscriptions
shall be held in escrow pending clearance of funds in accordance with applicable
banking  rules.  The parties  shall  coordinate  the release of funds during the
Offering Period, including the delivery to the Placement Agent of the securities
purchased by  Prospective  Investors,  and delivery of other  closing  documents
customarily  utilized by the  Placement  Agent and  satisfaction  of the closing
conditions  provided  in  Section 9 hereof.  Upon  satisfaction  of the  closing
conditions  hereof,  the funds  maintained in the escrow account shall be timely
remitted to the Company upon delivery of the appropriate  securities  evidencing
the Units purchased (the "Closing").

         4. Representations and Warranties of the Placement Agent.

            The  Placement  Agent  represents  and  warrants  to the  Company as
follows:

            (a) The Placement  Agent is duly organized and validly  existing and
in good standing under the laws of the State of New York.

            (b) The Placement Agent is, and at the time of each Closing will be,
a member in good standing of the NASD.

            (c)  Offers and Sales of Units by the  Placement  Agent will only be
made  in such  jurisdictions  in  which  the  Placement  Agent  is a  registered
broker-dealer or where an applicable exemption from such registration exists.

                                       2
<PAGE>

         5. Compensation and Other Matters.

            (a) The  Placement  Agent shall be  entitled,  on each  Closing,  as
compensation  for its  services  as  Placement  Agent  under this  Agreement,  a
commission  equal to 10% of the  gross  subscription  proceeds  received  by the
Company.

            (b) In addition to the  compensation  payable to the Placement Agent
set forth in clause (a)  above,  the  Company  shall pay the  Placement  Agent a
non-accountable  expense equal to 3% of the gross subscriptions  received by the
Company payable on the date hereof.

            (c) The Placement  Agent shall have a right to receive notice of all
meetings  of the  Company's  Board  of  Directors  and to have a  representative
present at all meetings of the Board of Directors.

            (d) The Company  agrees  that,  for a period of three (3) years from
the date hereof,  it shall not solicit any offer to buy from or offer to sell to
any person  introduced to the Company by the Placement  Agent in connection with
the Offering,  directly or  indirectly,  any securities of the Company or of any
other  entity,  or provide the name of any such  person to any other  securities
broker or dealer or selling  agent.  In the event that the Company or any of its
affiliates,  directly or indirectly,  solicits,  offers to buy from or offers to
sell to any such person any such  securities,  or provides  the name of any such
person to any other  securities  broker or  dealer or  selling  agent,  and such
person  purchases  such  securities  or  purchases  securities  from  any  other
securities  broker or dealer or  selling  agent,  the  Company  shall pay to the
Placement  Agent an amount equal to 10% of the aggregate  purchase  price of the
securities so purchased by such person.

            (e) In the event that  subscriptions  have been  received  in escrow
prior to the expiration of the Offering Period and accepted by the Company,  the
Placement Agent shall thereafter have an irrevocable  right of first refusal for
a period of three  years from the final  Closing to sell for the  account of the
Company,  or any subsidiary of or successor to the Company any securities of the
Company or any such subsidiary or successor of the Company,  that the Company or
any such  subsidiary  or  successor  may seek to sell  through  an  underwriter,
placement agent or broker-dealer  whether pursuant to registration under the Act
or otherwise.  The Company,  any such  subsidiary or successor will consult with
the  Placement  Agent  with  regard  to any such  offering  and will  offer  the
Placement Agent the opportunity to purchase or sell any such securities on terms
not more favorable to the Company,  any such  subsidiary or successor than it or
they can secure elsewhere as evidenced in writing obtained in good faith. If the
Placement  Agent  fails to accept such offer  within 10 business  days after the
mailing of a notice  containing  such offer by registered  mail addressed to the
Placement  Agent (five (5)  business  days in the event the offer  covers a sale
under Rule 144),  then the Placement  Agent shall have no further claim or right
with respect to the financing  proposal  contained in such notice.  If, however,
the terms of such proposal are  subsequently  modified in any material  respect,
the preferential  right referred to herein shall apply to such modified proposal
as if the original  proposal had not been made. The Placement Agent's failure to
exercise its  preferential  right with respect to any particular  proposal shall
not affect its  preferential  rights relative to future  proposals.  The Company
represents  and  warrants  that  there are  presently  no other  rights of first
refusal for future financing now outstanding.

                                       3
<PAGE>

            (f) Upon the final closing, the Company shall issue to the Placement
Agent a Unit Purchase Option, exercisable for five (5) years, to purchase 50% of
the aggregate number of Units sold in the Offering at an exercise price equal to
$.20 per Unit.

         6. Representations and Warranties of the Company.

            (a) The Company  represents  and warrants  to, and agrees with,  the
Placement Agent that:

               (i) The Offering  Documents (a) contain,  and at all times during
the period from the date hereof to and including each Closing,  will contain all
information  required to be contained therein, if any, pursuant to Rules 502 and
506 of Regulation D and all applicable federal and/or state securities and "blue
sky" laws,  and (b) shall not and does not,  and during  such  period  will not,
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated therein or necessary to make the  statements  therein
in light of the  circumstances  made  therein  not  misleading.  Each  contract,
agreement,  instrument,  lease,  license,  or  other  document  required  to  be
described  in the  Offering  Documents  shall  be,  and  have  been,  accurately
described therein.

               (ii) The Offering  Documents or information (it being  understood
that neither the Company nor any of its officers or directors or employees shall
provide any  information to any  Prospective  Investor which is not contained in
the Offering Documents)  provided by the Company to Prospective  Investors shall
not  contain  any  untrue  statement  of a  material  fact or omit to state  any
material fact required to be stated  therein or necessary to make the statements
therein in light of circumstances made therein not misleading.

               (iii) The Company is, and at all times during the period from the
date hereof to and including each Closing will be, a corporation duly organized,
validly  existing,  and in good standing  under the laws of the State of Nevada,
with  full  corporate  power  and  authority,  and has  obtained  all  necessary
consents, authorizations, approvals, orders, licenses, certificates, and permits
and declarations of and from, and has made filings with, all federal,  state and
local authorities, to own, lease, license, and use its properties and assets and
to conduct its  business as  presently  conducted  as  described in the Offering
Documents and/or in any such case where the failure to have any of the foregoing
would not have a material  adverse effect on the Company's  presently  conducted
business.  As of the date  hereof,  the Company is, and at all times  during the
period from the date hereof to and including each Closing,  duly qualified to do
business and is in good standing in every  jurisdiction  in which its ownership,
leasing, licensing, or use of property and assets or the conduct of its business
makes such  qualification  necessary except where the failure to be so qualified
would not have a material adverse effect on the Company's business.

               (iv) The Company has made,  or shall  make,  during the  Offering
Period all  required  filings  with the SEC and/or blue sky  authorities  of the
appropriate  states in connection  with the offer and sale of the Units so as to
comply with the  requirements  of  Regulation  D and /or the laws of the various
states.  The Company shall provide the Placement Agent with either (a) copies of
the  filings  (stamped  or  otherwise  indicating  filing)  or (b) an opinion of
counsel regarding the filings, within 10 days of closing of the Offering.

                                       4
<PAGE>

               (v) The financial information (the "Financial Statements") of the
Company  included in the Offering  Documents  fairly present in accordance  with
generally accepted accounting principles the financial position,  the results of
operations,  and the other  information with respect to the Company purported to
be shown therein at the respective dates and for the respective periods to which
they apply.  The  financial  information  included in the Offering  Documents is
correct  and  complete  and is in  accordance  with the books and records of the
Company.  There has at no time been a material  adverse  change in the financial
condition, results of operations,  business, properties, assets, liabilities, or
future  prospects of the Company from the latest  information set forth in the ,
except as may be properly described in the Offering Documents as having occurred
or as may occur and except for continued  deterioration  in the  Company's  cash
position and total assets and continued losses from operations.

               (vi) As of the date  hereof  there is no, and as of each  Closing
shall  not  be  any,  litigation,  arbitration,  claim,  governmental  or  other
proceeding  (formal or informal),  or investigation  pending or to the Company's
knowledge threatened, with respect to the Company, or its respective operations,
businesses,  properties, or assets, except as properly described in the Offering
Memorandum or such as  individually or in the aggregate do not now have and will
not in the future have a material adverse effect upon the operations,  business,
properties, or assets of the Company. The Company is not, nor as of each Closing
shall be, in  violation  of, or in  default  with  respect  to,  any law,  rule,
regulation,  order,  judgment,  or decree,  except as properly  described in the
Offering  Documents or such as  individually or in the aggregate do not have and
will not in the  future  have a material  adverse  effect  upon the  operations,
business,  properties,  or assets of the Company; nor is the Company required to
take any action in order to avoid any such violation or default.

               (vii) As of the date hereof, the Company is not, and at all times
during the period from the date hereof to and including each Closing,  shall not
be, in violation or breach of, or in default with respect to complying  with any
material  provision  of any material  contract,  agreement,  instrument,  lease,
license,  arrangement,  other than any such  violation or breach which would not
have,  individually  or in the  aggregate,  a  material  adverse  effect  on the
Company's  business,  and each  such  contract,  agreement,  instrument,  lease,
license,  arrangement, and under-standing is in full force and effect and is the
legal,  valid, and binding  obligation of the parties thereto  enforceable as to
them in accordance  with its terms.  The Company enjoys peaceful and undisturbed
possession  under all leases and licenses  under which it is operating as of the
date hereof.  As of the date  hereof,  the Company is not a party to or bound by
any  contract,   agreement,   instrument,   lease,  license,   arrangement,   or
understanding,  or subject to any charter or other restriction, which has had or
may in the future have a material  adverse  effect on the  financial  condition,
results of operations,  business,  properties,  assets,  liabilities,  or future
prospects  of the  Company.  The Company is not in violation or breach of, or in
default  with  respect  to,  any term of its  Certificate  of  Incorporation  or
By-Laws.

               (viii) To its best knowledge,  the Company has not infringed,  is
not  infringing,  or has not  received  notice of  infringement  with respect to
asserted  intangibles of others.  To the best knowledge of the Company,  none of
the patents,  patent  applications,  trademarks,  service marks, trade names and
copyrights,  and licenses and rights to the foregoing presently owned or held by
the  Company,  materially  infringe  upon any like right of any other  person or
entity.  The  Company  (i) owns or has the  right to use,  free and clear of all
liens, charges, claims,  encumbrances,  pledges, security interests,  defects or
other  restrictions  of any kind  whatsoever,  sufficient  patents,  trademarks,
service marks, trade names,  copyrights,  licenses and right with respect to the
foregoing, to conduct its business as presently conducted except as set forth in
the Offering  Documents and (ii) except as set forth in the Offering  Documents,
is not obligated or under any  liability  whatsoever to make any payments by way
of royalties,  fees or

                                       5
<PAGE>

otherwise  to any  owner or  licensee  of, or other  claimant  to,  any  patent,
trademark,  service mark, trade name, copyright,  know-how,  technology or other
intangible  asset,  with  respect to the use thereof or in  connection  with the
conduct of its business as now  conducted or  otherwise.  The Company has direct
ownership of title to all its intellectual property (including all United States
and  foreign  patent  applications  and  patents),   other  proprietary  rights,
confidential information and know-how; owns all the rights to its Intangibles as
are currently used in or have potential for use in its business.

               (ix) The Company has all requisite  corporate power and authority
to  execute,   deliver,  and  perform  this  Agreement  and  to  consummate  the
transactions  contemplated  hereby. All necessary  corporate  proceedings of the
Company  have  been  duly  taken  to  authorize  the  execution,  delivery,  and
performance  by the  Company  of  this  Agreement  and the  consummation  of the
transactions  contemplated  hereby.  This  Agreement  has been duly  authorized,
executed,  and  delivered  by  the  Company,  is a  legal,  valid,  and  binding
obligation of the Company,  and is  enforceable  as to the Company in accordance
with its terms.  Assuming the accuracy of the  representations and warranties of
the Prospective Investors set forth in the Subscription  Agreement and Ancillary
Documents and the  representations  and  warranties  of the Placement  Agent set
forth herein, no consent, authorization,  approval, order, license, certificate,
or permit of or from, or  registration,  qualification,  declaration,  or filing
with, any federal, state, local, foreign, or other governmental authority or any
court or other tribunal is required by the Company for the execution,  delivery,
or  performance  by the  Company  of this  Agreement,  the  consummation  of the
transactions  contemplated hereby and thereby,  except the filing of a Notice of
Sales of  Securities  on Form D pursuant  to  Regulation  D, and such  consents,
authorizations,  approvals, registrations, and qualifications as may be required
under all applicable  federal and/or securities or "blue sky" laws in connection
with the issuance,  sale, and delivery of the Units pursuant to this  Agreement.
No consent of any party to any material contract, agreement,  instrument, lease,
license,  arrangement,  or  understanding to which the Company is a party, or to
which  any of its  properties  or  assets  are  subject,  is  required  for  the
execution,  delivery, or performance of this Agreement,  and the consummation of
the transactions  contemplated hereby and thereby, and such execution,  delivery
and performance will not violate, result in a breach of, conflict with, or (with
or without  the giving of notice or the  passage  of time or both)  entitle  any
party  to  terminate  or call a  default  under  any such  contract,  agreement,
instrument, lease, license, arrangement, or understanding,  violate or result in
a breach of any term of the  certificate  of  incorporation  or  by-laws  of the
Company,  or assuming the accuracy of the  representations and warranties of the
Prospective   Investors   set  forth  in  the   purchase   agreements   and  the
representations and warranties of the Placement Agent set forth herein, violate,
result in a breach  of,  or  conflict  with any law,  rule,  regulation,  order,
judgment,  or decree  binding on the Company or to which any of its  operations,
businesses, properties, or assets are subject.

               (xi) The Units  conform  to all  statements  relating  thereto as
contained in the Offering Documents. The Units, when issued and delivered to the
Prospective  Investor  pursuant  to the  terms  of the  Offering  shall  be duly
authorized, validly issued, fully paid and non-assessable,  without any personal
liability  attaching to the  ownership  thereof  solely by being such holder and
shall  not  have  been  issued  in  violation  of  any   preemptive   rights  of
stockholders.

               (xii) Neither the Company nor any of its officers,  directors, or
affiliates,  has engaged or will engage,  directly or indirectly,  in any act or
activity that may jeopardize the status of the offering and sale of the Units as
an exempt transaction under the Act or under all applicable federal and/or state
securities  or "blue  sky"  laws of any  jurisdiction  in which the Units may be
offered or sold.

                                       6
<PAGE>

         7. Covenants of the Company.

            The Company covenants that it will:

            (a) Notify you immediately,  and confirm such notice in writing, (i)
when any event  shall have  occurred  during the period  commencing  on the date
hereof and ending on each Closing,  as a result of which the Offering  Documents
would  include  any untrue  statement  of a  material  fact or omit to state any
material fact required to be stated  therein or necessary to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading,  and (ii) of the  receipt of any  notification  with  respect to the
modification,  rescission,  withdrawal,  or suspension of the  qualification  or
registration  of  the  Units,  or of an  exemption  from  such  registration  or
qualification,  in any  jurisdiction.  The Company  will use its best efforts to
prevent  the  issuance  of any such  modification,  rescission,  withdrawal,  or
suspension and if you so request,  to obtain the lifting  thereof as promptly as
possible.

            (b) Not make any  supplement or amendment to the Offering  Documents
unless such  supplement or amendment  complies with the  requirements of the Act
and  Regulation D and the applicable  federal and/or state  securities and "blue
sky" laws and unless Meyers shall have received  copies of same. If, at any time
during the period commencing on the date hereof and ending on each Closing,  any
event shall have  occurred as a result of which the Offering  Documents  contain
any untrue  statement  of a  material  fact or omit to state any  material  fact
required to be stated  therein or necessary to make the  statements  therein not
misleading,  or if, in the  opinion of counsel to the  Company or counsel to the
Placement Agent, it is necessary at any time to supplement or amend the Offering
Documents to comply with the Act, Regulation D, or any applicable  securities or
"blue sky" laws, the Company will promptly prepare an appropriate  supplement or
amendment (in form and substance satisfactory to Meyers) which will correct such
statement or omission or which will effect such compliance.

            (c) Deliver  without  charge to the  Placement  Agent such number of
copies of the Offering  Documents and any supplement or amendment thereto as may
reasonably be requested by the Placement Agent.

            (d) Use its best  efforts  to  qualify  or  register  the  Units for
offering and sale under,  or establish an exemption from such  qualification  or
registration  under, the securities or "blue sky" laws of such  jurisdictions as
requested by the Placement Agent;  provided,  however, that the Company will not
be  obligated  to  qualify  to do  business  as a dealer  in  securities  in any
jurisdiction  in which it is not so qualified.  The Company will not  consummate
any sale of Units in any  jurisdiction  or in any  manner in which such sale may
not be lawfully made.

            (e) At all times during the period commencing on the date hereof and
ending on each Closing,  provide to each  Prospective  Investor or his Purchaser
Representative  (as  defined  in  Regulation  D),  if  any,  on  request,   such
information (in addition to that contained in the Offering Documents) concerning
the Offering, the Company and any other relevant matters, as it possesses or can
acquire  without   unreasonable  effort  or  expense,  and  to  extend  to  each
Prospective Investor or his Purchaser Representative, if any, the opportunity to
ask  questions of, and receive  answers from officers of the Company  concerning
the terms and  conditions of the Offering and the business of the Company and to
obtain any other additional information,  to the extent it possesses the same or
can  acquire  it  without  reasonable  effort or  expense,  as such  Prospective
Investor  or  Purchaser  Representative  may  consider  necessary  in  making an
informed  investment  decision  or in  order  to  verify  the  accuracy  of  the
information furnished to such Prospective Investor or Purchaser  Representative,
as the case may be.

                                       7
<PAGE>

            (f)  Notify you  promptly  of the  acceptance  or  rejection  of any
subscription. The Company shall not (i) accept subscriptions from, or make sales
of Units to, any Prospective  Investors who are not, to the Company's knowledge,
accredited investors, or (ii) unreasonably reject any subscription for Units.

            (g) File five (5) copies of a Notice of Sales of  Securities on Form
D with the Securities and Exchange  Commission (the  "Commission") no later than
15 days after the receipt of subscription funds for the first sale of the Units.
The Company  shall file  promptly  such  amendments  to such Notice on Form D as
shall become  necessary  and, as requested by the  Placement  Agent,  shall also
comply  with  any  filing  requirement  imposed  by the  laws  of any  state  or
jurisdiction  in which  offers and sales are made.  The  Company  shall  furnish
Meyers with copies of all such filings  (including  copies of cover  letters and
filing receipts) within five business days of the first Closing.  All filing and
other expenses  incurred by the Company in connection with such filings shall be
borne by the Company

            (h) Not, directly or indirectly, engage in any act or activity which
may  jeopardize  the  status  of the  offering  and sale of the  Units as exempt
transactions  under the Act or under the  securities  or "blue  sky" laws of any
jurisdiction in which the Offering maybe made.  Without  limiting the generality
of the foregoing, and notwithstanding anything contained herein to the contrary,
the  Company  shall not,  directly  or  indirectly,  engage in any  offering  of
securities  which, if integrated  with the Offering in the manner  prescribed by
Rule 502(a) of  Regulation  D and  applicable  releases of the  Commission,  may
jeopardize  the  status  of the  offering  and  sale  of  the  Units  as  exempt
transactions under Regulation D.

            (i) Not, during the period  commencing on the date hereof and ending
on each Closing Date,  issue any press release or other  communication,  or hold
any press  conference  with respect to the  Company,  its  financial  condition,
results of operations,  business,  properties,  assets,  or liabilities,  or the
Offering,  without your prior written consent,  except as required by applicable
securities  laws and except as may be related to the  marketing  and sale of its
products in the normal course of business.

         8. Payment of Expenses.

         The  Company  hereby  agrees to pay all  fees,  charges,  and  expenses
incident  to the  performance  by the  Company  of  its  obligations  hereunder,
including,  without limitation,  all fees,  charges,  and expenses in connection
with:(i) the  preparation  and printing of the Offering  Documents and all other
Ancillary  Documents relating to the offering,  purchase,  sale, and delivery of
the Units, and any supplements or amendments thereto,  including the cost of all
copies thereof;  (ii) the issuance,  sale, transfer,  and delivery of the Units,
including  any  transfer  or other  taxes  payable  thereon  and the fees of any
transfer agent or registrar;  and (iii) the registration or qualification of the
Units or the securing of an  exemption  therefrom  under state or foreign  "blue
sky" or securities laws,  including without  limitation,  filing fees payable in
the  jurisdictions  in which such  registration  or  qualification  or exemption
therefrom is sought and disbursements in connection therewith.

         9. Conditions of Placement Agent's Obligations.

                                       8
<PAGE>

         The obligations of the Placement Agent pursuant to this Agreement shall
be subject, in its discretion, to the continuing accuracy of the representations
and  warranties  of the Company  contained  herein and in each  certificate  and
document  contemplated  under this  Agreement to be  delivered to the  Placement
Agent,  as of the  date  hereof  and as of each  Closing,  with  respect  to the
performance by the Company of its  obligations  hereunder,  and to the following
conditions:

            (a) At each  Closing,  the  Placement  Agent  shall have  received a
certificate of the chief executive officer and of the chief financial officer of
the Company,  dated the  applicable  Closing Date to the effect that,  as of the
date of this Agreement and as of the applicable Closing Date the representations
and warranties of the Company  contained herein were and are accurate,  and that
as of the Closing Date the obligations to be performed by the Company  hereunder
on or prior thereto have been fully  performed.  Notwithstanding  the foregoing,
the  Company  hereby   represents  and  warrants  that  at  each  Closing,   the
representations and warranties contained herein shall be true and correct in all
respects. In addition,  the parties shall execute such cross receipts and escrow
release letters as may be required by the Placement Agent and escrow agent.

            (b) All proceedings taken in connection with the issuance, sale, and
delivery of the Units shall be  satisfactory  in form and  substance  to Meyers.
Certificates representing the securities constituting the Units subscribed to by
Investors   shall  be  delivered  to  Meyers  with  or  before  the  release  of
subscription  funds to the Company.  (d) There shall not have occurred after the
date  hereof,  at  any  time  prior  to  each  Closing:   (A)  any  domestic  or
international  event, act, or occurrence which has materially  disrupted,  or in
your opinion will in the  immediate  future  materially  disrupt the  securities
markets;  (B) a general  suspension  of, or a general  limitation on prices for,
trading in  securities  on the Nasdaq  SmallCap  Market or the  over-the-counter
market; (C) any banking moratorium declared by a state or federal authority; (D)
any material  interruption  in the mail service or other means of  communication
within the United  States;  (E) any  material  adverse  change in the  business,
properties,  assets,  results  of  operations,  or  financial  condition  of the
Company;  or (F) any  change in the  market  for  securities  in  general  or in
political,  financial, or economic conditions which, in your judgment,  makes it
inadvisable to proceed with the offering, sale, and delivery of the Units.

         Any  certificate or other document signed by any officer of the Company
and  delivered  to you or to  your  counsel  at a  Closing  shall  be  deemed  a
representation  and warranty by the Company  hereunder as to the statements made
therein.  If any condition to your obligations  hereunder has not been fulfilled
as and when required to be so fulfilled, you may terminate this Agreement or, if
you so elect, in writing waive any such conditions which have not been fulfilled
or  extend  the time for  their  fulfillment.  In the  event  that you  elect to
terminate  this  Agreement,  you shall  notify the  Company of such  election in
writing.  Upon such termination,  neither party shall have any further liability
or obligation to the other except as provided in Section 10 hereof.

         10. Termination.

         This Agreement may be terminated by the Placement  Agent (i) at anytime
in the event  the  Placement  Agent  has  determined,  in good  faith,  that the
Offering Documents fail to contain a material fact required to be stated therein
or necessary to make the  statements  therein not  misleading or (ii) upon three
days notice.  In the event that the  Agreement is  terminated as the result of a
material  breach by the  Company of any  covenant,  representation  or  warranty
contained in this  Agreement  then,  in that event,  and provided the  Placement
Agent is not in breach hereunder,  the Company shall be liable for the Placement
Agent's reasonable  expenses,  including counsel fees up to $25,000. The Company
may not  terminate  this  Agreement  in the absense of a material  breach of any
covenant,  representation  or warranty  contained in this  Agreement made by the
Placement Agent.

                                       9
<PAGE>

         11. Indemnification and Contribution.

            (a) The Company  agrees to indemnify and hold harmless the Placement
Agent, its officers,  directors,  partners,  employees, agents, and counsel, and
each person,  if any, who  controls  the  Placement  Agent within the meaning of
Section 15 of the Act or Section 20(a) of the  Securities  Exchange Act of 1934,
as amended (the "Exchange  Act"),  against any and all loss,  liability,  claim,
damage,  and expense  whatsoever (which shall include,  for all purposes of this
Section  11,  but not be limited  to,  attorneys'  fees and any and all  expense
whatsoever  incurred  in  investigating,  preparing,  or  defending  against any
litigation,  commenced or  threatened,  or any claim  whatsoever and any and all
amounts paid in  settlement  of any claim or  litigation)  as and when  incurred
arising out of, based upon,  or in connection  with (A) any untrue  statement or
alleged untrue statement of a material fact contained in the Offering  Documents
, or (B) in any  application  or  other  document  or  communication  (it  being
understood that neither the Company nor any officer,  director or employee shall
provide any  information to any  Prospective  Investor which is not contained in
the   Offering   Documents)   (in  this  Section  11   collectively   called  an
"application")  executed  by or on behalf of the  Company or based upon  written
information  furnished by or on behalf of the Company filed in any  jurisdiction
in order to register  or qualify  the Units  under the "blue sky" or  securities
laws  thereof  or in order to secure an  exemption  from  such  registration  or
qualification or filed with the Commission;  or any omission or alleged omission
to state a material fact required to be stated  therein or necessary to make the
statements therein not misleading, unless such statement or omission was made in
reliance  upon and in  conformity  with  written  information  furnished  to the
Company as stated in Section 11(b) with respect to the Placement Agent expressly
for inclusion in the Offering  Documents or in any application,  as the case may
be; or (ii) any breach of any representation,  warranty,  covenant, or agreement
of the Company contained in this Agreement. The foregoing agreement to indemnify
shall be in addition to any liability the Company may otherwise have,  including
liabilities arising under this Agreement.

         If any  action is brought  against  the  Placement  Agent or any of its
officers, directors,  partners, employees, agent, or counsel, or any controlling
persons of the Placement  Agent (an  "indemnified  party"),  in respect of which
indemnify may be sought against the Company pursuant to the foregoing paragraph,
such  indemnified  party or  parties  shall  promptly  notify the  Company  (the
"indemnifying  party") in writing of the  institution  of such  action  (but the
failure so to notify shall not relieve the indemnifying party from any liability
it may have other than  pursuant  to this  Section  11(a)) and the  indemnifying
party shall promptly assume the defense of such action, including the employment
of counsel  (reasonably  satisfactory to such indemnified  party or parties) and
payment of expenses.  Such indemnified  party shall have the right to employ its
own counsel in any such case,  but the fees and expense of such counsel shall be
at the expense of such  indemnified  party unless the employment of such counsel
shall have been  authorized in writing by the  indemnifying  party in connection
with the  defense  of such  action  or the  indemnifying  party  shall  not have
promptly  employed counsel  satisfactory to such indemnified party or parties to
have charge of the defense of such action or such  indemnified  party or parties
shall have  reasonably  concluded  that there may be one or more legal  defenses
available to it or them or to other indemnified parties which are different from
or additional to those available to one or more of the indemnifying  parties, in
any of which events such fees and expenses of one such counsel shall be borne by
the indemnifying  party and the  indemnifying  party shall not have the right to
direct the defense of such action on behalf of the indemnified party or parties.
Anything in this  paragraph to the contrary  notwithstanding,  the  indemnifying
party  shall  not be  liable  for any  settlement  of any such  claim or  action
effected without its written consent.  The Company agrees promptly to notify the
Placement Agent of the commencement of any litigation or proceedings against the
Company or any of its officers or directors in  connection  with the sale of the
Units, the Offering Documents, or any application.

                                       10
<PAGE>

            (b) The  Placement  Agent agrees to indemnify  and hold harmless the
Company, its officers, directors, employees, agents, and counsel, and each other
person, if any, who controls the Company within the meaning of Section 15 of the
Act or Section  20(a) of the Exchange  Act, to the same extent as the  foregoing
indemnity from the Company to the Placement Agent in Section 11(a), with respect
to any and all loss,  liability,  claim,  damage,  and expense whatsoever (which
shall  include,  for all  purposes  of this  Section  11, but not be limited to,
attorneys' fees and any and all expense  whatsoever  incurred in  investigating,
preparing, or defending against any litigation,  commenced or threatened, or any
claim  whatsoever  and any and all amounts  paid in  settlement  of any claim or
litigation)  as and when  incurred  arising out of, based upon, or in connection
with (i)  statements  or omissions,  if any,  made in the Offering  Documents in
reliance  upon and in  conformity  with  written  information  furnished  to the
Company  as  stated in this  Section  11 with  respect  to the  Placement  Agent
expressly for inclusion in the Offering  Documents,  and (ii) the failure of the
Placement  Agent to comply with the  provisions  of the "blue sky" or securities
laws of the jurisdictions in which the Placement Agent solicits offers to buy or
offers to sell any Units or any breach of any representation, warranty, covenant
or agreement of the Placement Agent  contained in this Agreement.  If any action
shall be brought against the Company or any other person so indemnified based on
the Offering  Documents and in respect of which  indemnity may be sought against
the Placement  Agent pursuant to this Section 11, the Placement Agent shall have
the rights and duties given to the indemnifying  party, and the Company and each
other  person so  indemnified  shall have the  rights  and  duties  given to the
indemnified parties, by the provisions of Section 11(a) hereof.

            (c) To  provide  for  just  and  equitable  contribution,  if (i) an
indemnified party makes a claim for indemnification pursuant to Section 11(a) or
11(b) hereof but it is found in a final judicial  determination,  not subject to
further appeal, that such indemnification may not be enforced in such case, even
though this Agreement  expressly  provides for  indemnification in such case, or
(ii) any indemnified or indemnifying party seeks contribution under the Act, the
Exchange Act, or  otherwise,  then the Company  (including  for this purpose any
contribution made by or on behalf of any officer, director,  employee, agent, or
counsel of the Company,  or any controlling  person of the Company),  on the one
hand, and the Placement Agent (including for this purpose any contribution by or
on behalf of an indemnified  party),  on the other hand, shall contribute to the
losses,  liabilities,  claims,  damages, and expenses whatsoever to which any of
them may be  subject,  in such  proportions  as are  appropriate  to reflect the
relative  benefits  received by the Company,  on the one hand, and the Placement
Agent,  on the other hand;  provided,  however,  that if applicable law does not
permit such allocation, then other relevant equitable considerations such as the
relative  fault of the Company and the Placement  Agent in  connection  with the
facts which resulted in such losses, liabilities,  claims, damages, and expenses
shall also be considered.  The relative benefits received by the Company, on the
one hand, and the Placement  Agent, on the other hand,  shall be deemed to be in
the  same  proportion  as (x) the  total  proceeds  from  the  Offering  (net of
compensation  payable to the Placement Agent pursuant to Section 5(a) hereof but
before  deducting  expenses)  received by the Company,  and (y) the compensation
received by the Placement Agent pursuant to Section 5(a) hereof.

                                       11
<PAGE>

         The relative fault, in the case of an untrue statement,  alleged untrue
statement,  omission,  or alleged omission,  shall be determined by, among other
things, whether such statement, alleged statement, omission, or alleged omission
relates to information  supplied by the Company or by the Placement  Agent,  and
the parties' relative intent, knowledge, access to information,  and opportunity
to correct or prevent such statement,  alleged statement,  omission,  or alleged
omission.  The Company and the Placement Agent agree that it would be unjust and
inequitable if the respective obligations of the Company and the Placement Agent
for  contribution  were  determined by pro rata or per capita  allocation of the
aggregate losses,  liabilities,  claims,  damages,  and expenses or by any other
method of allocation that does not reflect the equitable considerations referred
to in this Section  11(c).  In no case under this Section 11 shall the Placement
Agent by responsible for a portion of the  contribution  obligation in excess of
the  compensation  received  by it pursuant to Section  5(a)  hereof.  No person
guilty of a fraudulent  misrepresentation shall be entitled to contribution from
any person who is not guilty of such fraudulent misrepresentation.  For purposes
of this Section  11(c),  each person,  if any, who controls the Placement  Agent
within the meaning of Section 15 of the Act or Section 20(a) of the Exchange Act
and each  officer,  director,  partners,  employee,  agent,  and  counsel of the
Placement  Agent,  shall have the same rights to  contribution  as the Placement
Agent,  and each person,  if any, who controls the Company within the meaning of
Section 15 of the Act or Section  20(a) of the  Exchange  Act and each  officer,
director,  employee,  agent,  and  counsel of the  Company,  shall have the same
rights to contribution as the Company, subject in each case to the provisions of
this  Section   11(c).   Anything  in  this   Section   11(c)  to  the  contrary
notwithstanding,  no party shall be liable for contribution  with respect to the
settlement of any claim or action effected without its written consent.

         12. Non-Solicitation.

         The  Company  agrees  that,  for a period  of 36  months  from the date
hereof,  it  shall  not  solicit  any  offer to buy from or offer to sell to any
person  introduced to the Company by the Placement  Agent in connection with the
Offering,  directly or indirectly, any securities of the Company or of any other
entity, or provide the name of any such person to any other securities broker or
dealer  or  Placement  Agent.  In  the  event  that  the  Company  or any of its
affiliates,  directly or indirectly,  solicits,  offers to buy from or offers to
sell to any such person any such  securities,  or provides  the name of any such
person to any other  securities  broker or dealer or Placement  agent,  and such
person  purchases  such  securities  or  purchases  securities  from  any  other
securities  broker or dealer or Placement  agent,  the Company  shall pay to the
Placement  Agent an amount equal to 8% of the  aggregate  purchase  price of the
securities so purchased by such person.

         13. Representations and Agreements to Survive Delivery.

         All representations, warranties, covenants, and agreements contained in
this Agreement shall be deemed to be representations, warranties, covenants, and
agreements at each Closing and, such representations, warranties, covenants, and
agreements,  including the indemnification and contribution agreements contained
in Section 11, shall remain operative and in full force and effect regardless of
any investigation made by or on behalf of the Placement Agent or any indemnified
person,  or by or on  behalf of the  Company  or any  person or entity  which is
entitled to be indemnified under Section 11(b), and shall survive termination of
this Agreement or the issuance,  sale,  and delivery of the Units.  In addition,
notwithstanding any election hereunder or any termination of this Agreement, and
whether  or not the terms of this  Agreement  are  otherwise  carried  out,  the
provisions of Sections 6, 11 and 12 shall survive  termination of this Agreement
and shall not be affected in any way by such election or  termination or failure
to carry out the terms of this Agreement or any part thereof.

                                       12
<PAGE>

         14. Notices.

         All communications  hereunder,  except as may be otherwise specifically
provided  herein,  shall be in  writing  and shall be either (i) mailed by first
class  mail in  which  case  delivery  shall be  deemed  to be made  three  days
following  deposit in the United States mail; or (ii) sent by overnight  courier
service in case  delivery  shall be deemed to be made upon  receipt,  to: Meyers
Associates,  L.P., 45 Broadway, 2nd Floor, New York, New York 10006,  Attention:
Bruce Meyers, with a copy to Goldstein & DiGioia LLP, 45 Broadway, New York, New
York 10006 Attention: Stanley R. Goldstein, Esq.; NanoSensors,  Inc., 1800 Wyatt
Drive, Suite #2, Santa Clara, California 95054 Attention: President.

         15. Parties.

         This  Agreement  shall  inure  solely to the  benefit  of, and shall be
binding upon,  the Placement  Agent and the Company and the persons and entities
referred to in Section 11 who are entitled to  indemnification  or contribution,
and their respective successors, legal representatives, and assigns (which shall
not include any purchaser, as such, of Units), and no other person shall have or
be construed to have any legal or equitable  right remedy,  or claim under or in
respect of or by virtue of this Agreement or any provision herein contained.

         16. Construction.

         This  Agreement  shall be construed in accordance  with the laws of the
State of New York, without giving effect to conflict of laws.

         17. Counterparts.

         This  Agreement  may be executed in  counterparts,  each of which shall
constitute an original and all of which,  when taken together,  shall constitute
one agreement.

                                       13
<PAGE>

         If the foregoing  correctly  sets forth the  understanding  between us,
please so indicate in the space provided below for that purpose,  whereupon this
letter shall constitute a binding agreement among us.

                                          Very truly yours,

                                          NANOSENSORS, INC.

                                          By: /s/ Ted L. Wong
                                            ------------------------------------
                                            Name:   Ted L. Wong
                                            Title:  President

Accepted as of the date first above written:

MEYERS ASSOCIATES, L.P.
By: Meyers-Janssen Securities Corp.
    (General Partner)

By: /s/ Bruce Meyers
  ----------------------------------
  Name:  Bruce Meyers
  Title: President

                                       14

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