Document:

EXECUTION COPY
EXHIBIT 10.34

                          REGISTRATION RIGHTS AGREEMENT

      This REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of
December 30, 2005, is by and between DATAMETRICS CORPORATION, a Delaware
corporation (the "Corporation"), and SG DMTI Capital LLC, a New York limited
liability company (the "Investor").

      WHEREAS, the Corporation has agreed, on the terms and subject to the
conditions set forth in the Stock and Warrant Purchase Agreement, dated as of
December 30, 2005 (the "Purchase Agreement"), to issue and sell to the Investor
shares of Series B Preferred Stock and a warrant exercisable into shares of the
Common Stock (the "Warrant"). Capitalized terms used herein and not otherwise
defined shall have the respective meanings set forth in the Purchase Agreement.

      WHEREAS, in order to induce the Investor to enter into the Purchase
Agreement, the Company has agreed to provide certain registration rights under
the Securities Act of 1933, as amended, and under applicable state securities
laws.

      In consideration of the Investor entering into the Purchase Agreement, and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties agree as follows:

                                   SECTION 1
                                   DEFINITIONS

      As used in this Agreement the following terms shall have the following
meanings:

      "Commission" means the Securities and Exchange Commission or any other
Federal agency at the time administering the Securities Act.

      "Common Stock" means, the common stock, $.01 par value per share, of the
Corporation.

      "Exchange Act" means the Securities Exchange Act of 1934 or any successor
Federal statute, and the rules and regulations of the Commission promulgated
thereunder, all as the same shall be in effect from time to time.

      "Investor" means SG DMTI Capital LLC and each additional person who shall
execute a counterpart signature page hereto, and includes any successor to, or
assignee or transferee of, any such person who or which agrees in writing to be
treated as an Investor hereunder and to be bound by the terms and comply with
all applicable provisions hereof.

      "Other Shares" means at any time those shares of Common Stock which do not
constitute Primary Shares or Registrable Shares.

      "Primary Shares" means at any time the authorized but unissued shares of
Common Stock held by the Corporation in its treasury.

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      "Registrable Shares" means shares of Common Stock issuable upon exercise
of the Warrant. As to any particular Registrable Shares, once issued, such
Registrable Shares shall cease to be Registrable Shares when (i) they have been
registered under the Securities Act, the registration statement in connection
therewith has been declared effective and they have been disposed of pursuant to
such effective registration statement, (ii) they are eligible to be sold or
distributed pursuant to Rule 144 within any consecutive three month period
(including, without limitation, Rule 144(k)) without volume limitations, or
(iii) they shall have ceased to be outstanding.

      "Registration Date" means the date upon which the registration statement
pursuant to which the Corporation shall have initially registered shares of
Common Stock under the Securities Act for sale to the public shall have been
declared effective.

      "Rule 144" means Rule 144 promulgated under the Securities Act or any
successor rule thereto or any complementary rule thereto (such as Rule 144A).

      "Securities Act" means the Securities Act of 1933 or any successor Federal
statute, and the rules and regulations of the Commission thereunder, all as the
same shall be in effect from time to time.

                                   SECTION 2
                              REQUIRED REGISTRATION

      On any date after three (3) months following the Registration Date, if
holders representing not less than 50% of the Registrable Shares then
outstanding shall in writing state that such holders desire to sell Registrable
Shares in the public securities markets and request the Corporation to effect
the registration under the Securities Act of Registrable Shares, the Corporation
shall promptly use its best efforts to effect the registration under the
Securities Act of the Registrable Shares which the Corporation has been so
requested to register; provided, however, that the Corporation shall not be
obligated to effect any registration under the Securities Act except in
accordance with the following provisions:

      (a) the Corporation shall not be obligated to use its best efforts to file
and cause to become effective (i) more than one registration statement initiated
pursuant to this Section 2 in any six-month period, (ii) more than two
registration statements initiated pursuant to this Section 2 on Form S-1
promulgated under the Securities Act or any successor from thereto, (iii) any
registration on Form S-3 (or any comparable or successor form) until the
Corporation has qualified for use thereof, at which time there shall be no limit
on the number of registrations on Form S-3 that the holder may request or (iv)
any registration statements during any period in which any other registration
statement (other than on Form S-4 or Form S-8 promulgated under the Securities
Act or any successor forms thereto) pursuant to which Primary Shares are to be
or were sold has been filed and not withdrawn or has been declared effective
within the 90 days.

      (b) the Corporation may delay the filing or effectiveness of any
registration statement for a period of up to 90 days after the date of a request
for registration pursuant to this Section 2 if at the time of such request (i)
the Corporation is engaged, or has fixed plans to engage within 90 days of the
time of such request, in a firm commitment underwritten public offering of
Primary Shares in which the holders of Registrable Shares may include
Registrable Shares pursuant to Section 3 or (ii) the Corporation reasonably
determines that such registration and offering would interfere with any material
transaction involving the Corporation, as approved by the Board of Directors,
provided, however, that the Corporation may only delay the filing or
effectiveness of a registration statement pursuant to this Section 2(b) for a
total of 120 days after the date of a request for registration pursuant to this
Section 2.

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      (c) with respect to any registration pursuant to this Section 2, the
Corporation shall give notice of such registration to the holders of all Other
Shares which are entitled to registration rights and the Corporation may include
in such registration any Primary Shares or Other Shares; provided, however, that
if the managing underwriter advises the Corporation that the inclusion of all
Registrable Shares, Primary Shares and/or Other Shares proposed to be included
in such registration would interfere with the successful marketing (including
pricing) of the Registrable Shares proposed to be included in such registration,
then the number of Registrable Shares, Primary Shares and/or Other Shares
proposed to be included in such registration shall be included in the following
order:

            (i) first, the Registrable Shares requested to be included in such
      registration (or, if necessary, such Registrable Shares pro rata among the
      holders thereof based upon the number of Registrable Shares requested to
      be registered by each such holder);

            (ii) second, the Primary Shares; and

            (iii) third, the Other Shares which are entitled to registration
      rights.

      (d) At any time before the registration statement covering Registrable
Shares become effective, the holders of a majority of such shares may request
the Corporation to withdraw or not to file the registration statement. In that
event, if such request of withdrawal shall not have been caused by, or made in
response to, the material adverse effect of an event on the business,
properties, conditions, financial or otherwise, or operations of the
Corporation, the holders shall have used their demand registration right under
this Section 2 and the Corporation shall no longer be obligated to register
Registrable Shares pursuant to the exercise of such registration right pursuant
to this Section 2 unless the remaining holders shall pay to the Corporation the
expenses incurred by the Corporation through the date of such request.

                                   SECTION 3
                             PIGGYBACK REGISTRATION

      If the Corporation at any time proposes for any reason to register Primary
Shares or Other Shares under the Securities Act (other than on Form S-4 or Form
S-8 promulgated under the Securities Act or any successor forms thereto), it
shall give written notice to the Investor of its intention to register such
Primary Shares or Other Shares at least thirty (30) days before the initial
filing of such registration statement and, upon the written request, delivered
to the Corporation within twenty (20) days after delivery of any such notice by
the Corporation, of the Investor to include in such registration Registrable
Shares (which request shall specify the number of Registrable Shares proposed to
be included in such registration and shall state that the Investors desires to
sell such Registrable Shares in the public securities markets), the Corporation
shall use its best efforts to cause all such Registrable Shares to be included
in such registration on the same terms and conditions as the securities
otherwise being sold in such registration; provided, however, that if the
managing underwriter advises the Corporation that the inclusion of all
Registrable Shares requested to be included in such registration would interfere
with the successful marketing (including pricing) of the Primary Shares or Other
Shares proposed to be registered by the Corporation, then the number of Primary
Shares, Registrable Shares and Other Shares proposed to be included in such
registration shall be included in the following order:

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<PAGE>

      (a) if the Corporation proposes to register Primary Shares, or Primary
Shares and Other Shares:

            (i) First, the Primary Shares; and

            (ii) Second, the Registrable Shares and Other Shares requested to be
      included in such registration (or, if necessary, such Registrable Shares
      and Other Shares pro rata among the holders thereof based upon the number
      of shares of Registrable Shares and Other Shares requested to be
      registered by each such holder); or

      (b) if the Corporation proposes to register Other Shares pursuant to a
request for registration by the holders of such Other Shares (other than
pursuant to Section 3 hereof):

            (i) First, the Other Shares held by the parties demanding such
      registration; and

            (ii) Second, the Registrable Shares and Other Shares (other than
      shares registered pursuant to Section 3(b)(1) hereof) requested to be
      registered by the holders hereof (or, if necessary, pro rata among the
      holders thereof based on the number of Registrable Shares and Other Shares
      requested to be registered by such holders).

                                   SECTION 4
                             PREPARATION AND FILING

      If and whenever the Corporation is under an obligation pursuant to the
provisions of this Agreement to use its best efforts to effect the registration
of any Registrable Shares, the Corporation shall as expeditiously as
practicable:

      (a) use its best efforts to cause a registration statement that registers
such Registrable Shares to become and remain effective for a period of 90 days
or until all of such Registrable Shares have been disposed of (if earlier);

      (b) furnish, at least ten (10) business days before filing a registration
statement that registers such Registrable Shares, a prospectus relating thereto
or any amendments or supplements relating to such a registration statement or
prospectus, to one counsel selected by the Investors (the "Investor's Counsel"),
copies of all such documents proposed to be filed and permit Investor's Counsel
to review the registration statement, the prospectus and any amendments or
supplements thereto(it being understood that such ten-business-day period need
not apply to successive drafts of the same document proposed to be filed so long
as such successive drafts are supplied to the Investor's Counsel in advance of
the proposed filing and within a reasonable period of time following the receipt
of any comments by the staff of the Commission by he Corporation);

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<PAGE>

      (c) prepare and file with the Commission such amendments and supplements
to such registration statement and the prospectus used in connection therewith
as may be necessary to keep such registration statement effective for at least a
period of 90 days or until all of such Registrable Shares have been disposed of
(if earlier) and to comply with the provisions of the Securities Act with
respect to the sale or other disposition of such Registrable Shares;

      (d) notify in writing the Investor's Counsel promptly (i) of the receipt
by the Corporation of any notification with respect to any comments by the
Commission with respect to such registration statement or prospectus or any
amendment or supplement thereto or any request by the Commission for the
amending or supplementing thereof or for additional information with respect
thereto, (ii) of the receipt by the Corporation of any notification with respect
to the issuance by the Commission of any stop order suspending the effectiveness
of such registration statement or prospectus or any amendment or supplement
thereto or the initiation or threatening of any proceeding for that purpose and
(iii) of the receipt by the Corporation of any notification with respect to the
suspension of the qualification of such Registrable Shares for sale in any
jurisdiction or the initiation or threatening of any proceeding for such
purposes; (e) use its best efforts to register or qualify such Registrable
Shares under such other securities or blue sky laws of such jurisdictions as the
Investors reasonably request and do any and all other acts and things which may
be reasonably necessary or advisable to enable the Investors to consummate the
disposition in such jurisdictions of the Registrable Shares owned by the
Investors; provided, however, that the Corporation will not be required to
qualify generally to do business, subject itself to general taxation or consent
to general service of process in any jurisdiction where it would not otherwise
be required to do so but for this paragraph (e) or to provide any material
undertaking or make any changes in its By-laws or Certificate of Incorporation
which the Board of Directors determines to be contrary to the best interests of
the Corporation or to modify any of its contractual relationships then existing;

      (f) furnish to the Investor holding such Registrable Shares such number of
copies of a summary prospectus, if any, or other prospectus, including a
preliminary prospectus, in conformity with the requirements of the Securities
Act, and such other documents as such Investors may reasonably request in order
to facilitate the public sale or other disposition of such Registrable Shares;

      (g) in the event of an underwritten public offering of the Registrable
Shares, enter into (together with all holders proposing to distribute
Registrable Securities through such underwriting) and perform its obligations
under an underwriting agreement, in usual and customary form reasonably
acceptable to the Corporation, with the managing underwriter of such offering;

      (h) without limiting subsection (e) above, use its best efforts to cause
such Registrable Shares to be registered with or approved by such other
governmental agencies or authorities as may be necessary by virtue of the
business and operations of the Corporation to enable the Investors holding such
Registrable Shares to consummate the disposition of such Registrable Shares;

      (i) notify the Investor holding such Registrable Shares on a timely basis
at any time when a prospectus relating to such Registrable Shares is required to
be delivered under the Securities Act within the appropriate period mentioned in
subparagraph (a) of this Section 4, of the happening of any event as a result of
which the prospectus included in such registration statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing and, at the request
of the Investor, prepare and furnish to such Investor a reasonable number of
copies of a supplement to or an amendment of such prospectus as may be necessary
so that, as thereafter delivered to the offerees of such shares, such prospectus
shall not include an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading in light of the circumstances then existing;

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<PAGE>

      (j) subject to the execution of confidentiality agreements in form and
substance satisfactory to the Corporation, make available upon reasonable notice
and during normal business hours, for inspection by the Investor holding such
Registrable Shares, any underwriter participating in any disposition pursuant to
such registration statement and any attorney, accountant or other agent retained
by the Investor or underwriter (collectively, the "Inspectors"), all pertinent
financial and other records, pertinent corporate documents and properties of the
Corporation (collectively, the "Records"), as shall be reasonably necessary to
enable them to exercise their due diligence responsibility, and cause the
Corporation's officers, directors and employees to supply all information
(together with the Records, the "Information") reasonably requested by any such
Inspector in connection with such registration statement. Any of the Information
which the Corporation determines in good faith to be confidential and of which
determination the Inspector is so notified, shall not be disclosed by the
Inspectors unless (i) the disclosure of such Information is necessary to avoid
or correct a misstatement or an omission in the registration statement, (ii) the
release of such Information is ordered pursuant to a subpoena or other order
from a court of competent jurisdiction or (iii) such Information has been made
generally available to the public; the Investor agrees that it will, upon
learning that disclosure of such information is sought in a court of competent
jurisdiction, give notice to the Corporation and allow the Corporation, at the
Corporation's expense, to undertake appropriate action to prevent disclosure of
the Information deemed confidential;

      (k) use its best efforts to obtain from its independent certified public
accountants "cold comfort" letters addressed to the Corporation and any selling
Stockholders in customary form and at customary times and covering matters of
the type customarily covered by cold comfort benefits;

      (l) use all commercially reasonable efforts to prevent the issuance of any
stop order or other order suspending the effectiveness of the registration
statement and, if such an order is issued, to obtain the withdrawal thereof at
the earliest possible time and to notify the Investor of the issuance of such
order and the resolution thereof;

      (m) furnish to the Investor, on the date that the registration statement
becomes effective, a letter, dated such date, of outside counsel representing
the Corporation (and reasonably acceptable to the Investor) addressed to the
Investor, confirming such effectiveness and, to the knowledge of such counsel,
the absence of any stop order;

      (n) provide a transfer agent and registrar (which may be the same entity
and which may be the Corporation) for such Registrable Shares;

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<PAGE>

      (o) issue to any underwriter to which the Investor holding such
Registrable Shares may sell shares in such offering certificates evidencing such
Registrable Shares;

      (p) list such Registrable Shares on any national securities exchange on
which any shares of the Common Stock are listed or, if the Common Stock is not
listed on a national securities exchange, use its best efforts to qualify such
Registrable Shares for inclusion on the automated quotation system of the
National Association of Securities Dealers, Inc. (the "NASD"), or such other
national securities exchange as the holders of a majority of such Registrable
Shares shall reasonably request;

      (q) hold in confidence and not make any disclosure of information
concerning the Investor provided to the Corporation if at the time such
information is provided the Corporation is notified of the confidential nature
of such information unless (i) disclosure of such information is necessary to
comply with federal or state securities laws, (ii) the disclosure of such
information is necessary to avoid or correct a misstatement or omission in any
registration statement that includes the Investor's Registrable Shares, (iii)
the release of such information is ordered pursuant to a subpoena or other order
from a court or governmental body of competent jurisdiction, (iv) such
information has been made generally available to the public other than by
disclosure in violation of this or any other agreement, or (v) the Investor
consents to the form and content of any such disclosure. The Corporation shall,
upon learning that disclosure of any information concerning the Investor is
sought in or by a court or governmental body of competent jurisdiction or
through other means, give prompt notice to the Investor prior to making such
disclosure, and cooperate with the Investor in taking appropriate action to
prevent disclosure of, or to obtain a protective order for, such information;

      (r) otherwise use its best efforts to comply with all applicable rules and
regulations of the Commission and make available to its security holders, as
soon as reasonably practicable, earnings statements (which need not be audited)
covering a period of twelve (12) months beginning within three months after the
effective date of the registration statement, which earnings statements shall
satisfy the provisions of Section 11 (a) of the Securities Act; and

      (s) subject to all the other provisions of this Agreement, use its best
efforts to take all other steps accessory to effect the registration of such
Registrable Shares contemplated hereby.

      Each holder of the Registrable Shares, upon receipt of any notice from the
Corporation of any event of the kind described in Section 5(i) hereof, shall
forthwith discontinue disposition of the Registrable Shares pursuant to the
registration statement covering such Registrable Shares until such holders'
receipt of the copies of the supplemented or amended prospectus contemplated by
Section 5(i) hereof, and, if so directed by the Corporation, such holder shall
deliver to the Corporation all copies, other than permanent file copies then in
such holder's possession, of the prospectus covering such Registrable Shares at
the time of receipt of such notice.

                                   SECTION 5
                                    EXPENSES

      All expenses (other than underwriting discounts and commissions relating
to the Registrable Shares, as provided in the last sentence of this Section 5)
incurred by the Corporation in complying with Section 4, including, without
limitation, all registration and filing fees (including all expenses incident to
filing with the NASD), fees and expenses of complying with securities and blue
sky laws, printing expenses, fees and expenses of the Corporation's counsel and
accountants, and reasonable fees and expenses of the Investors' Counsel, shall
be paid by the Corporation; provided, however, that all underwriting discounts
and selling commissions applicable to the Registrable Shares and Other Shares
shall be borne by the holders selling such Registrable Shares and Other Shares,
in proportion to the number of Registrable Shares and Other Shares sold by each
such holder.

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                                   SECTION 6
                                 INDEMNIFICATION

      (a) In connection with any registration of any Registrable Shares under
the Securities Act pursuant to this Agreement, the Corporation shall indemnify
and hold harmless the holders of Registrable Shares, each underwriter, broker or
any other person acting on behalf of the holders of Registrable Shares and each
other person, if any, who controls any of the foregoing persons within the
meaning of the Securities Act against any losses, claims, damages or
liabilities, joint or several (or actions in respect thereof), to which any of
the foregoing persons may become subject under the Securities Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon an untrue statement or allegedly untrue
statement of a material fact contained in the registration statement under which
such Registrable Shares were registered under the Securities Act, any
preliminary prospectus or final prospectus contained therein or otherwise filed
with the Commission, any amendment or supplement thereto or any document
incident to registration or qualification of any Registrable Shares, or arise
out of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading or, with respect to any prospectus, necessary to make the
statements therein in light of the circumstances under which they were made not
misleading, or any violation by the Corporation of the Securities Act or state
securities or blue sky laws applicable to the Corporation and relating to action
or inaction required of the Corporation in connection with such registration or
qualification under such state securities or blue sky laws; and shall reimburse
the holders of Registrable Shares, such underwriter, such broker or such other
person acting on behalf of the holders of Registrable Shares and each such
controlling person for any legal or other expenses reasonably incurred by any of
them in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that the Corporation shall not be liable
in any such case to the extent that any such loss, claim, damage, liability or
action (including any legal or other expenses incurred) arises out of or is
based upon an untrue statement or allegedly untrue statement or omission or
alleged omission made in said registration statement, preliminary prospectus,
final prospectus, amendment supplement or document incident to registration or
qualification of any Registrable Shares in reliance upon and in conformity with
written information furnished to the Corporation through an instrument duly
executed by the holders of Registrable Shares or their counsel or underwriter
specifically for use in the preparation thereof; provided further, however, that
the foregoing indemnity agreement is subject to the condition that, insofar as
it relates to any untrue statement, omission or alleged omission made in any
preliminary prospectus but eliminated or remedied in the final prospectus (filed
pursuant to Rule 424 of the Securities Act), such indemnity agreement shall not
inure to the benefit of the Investor, any underwriter, broker or other person
acting on behalf of holders of the Restricted Shares from whom the person
asserting any loss, claim, damage, liability or expense purchased the Restricted
Shares which are the subject thereof, if a copy of such final prospectus had
been made available to such person and such Investor, underwriter, broker or
other person acting on behalf of holders of the Registrable Shares and such
final prospectus was not delivered to such person with or prior to the written
confirmation of the sale of such Registrable Shares to such person.

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<PAGE>

      (b) In connection with any registration of Registrable Shares under the
Securities Act pursuant to this Agreement, each holder of Registrable Shares
shall severally and not jointly indemnify and hold harmless (in the same manner
and to the same extent as set forth in the preceding paragraph of this Section
6) the Corporation, each director of the Corporation, each officer of the
Corporation who shall sign such registration statement, each underwriter, broker
or other person acting on behalf of the holders of Registrable Shares and each
person who controls any of the foregoing persons within the meaning of the
Securities Act with respect to any statement or omission from such registration
statement, any preliminary prospectus or final prospectus contained therein or
otherwise filed with the Commission, any amendment or supplement thereto or any
document incident to registration or qualification of any Registrable Shares, if
such statement or omission was made in reliance upon and in conformity with
written information furnished to the Corporation or such underwriter
specifically for use in connection with the preparation of such registration
statement, preliminary prospectus, final prospectus, amendment, supplement or
document; provided, however, that the maximum amount of liability in respect of
such indemnification shall be limited, in the case of each Seller of Registrable
Shares, to an amount equal to the net proceeds actually received by such Seller
from the sale of Registrable Shares effected pursuant to such registration.

      (c) Promptly after receipt by an indemnified party of notice of the
commencement of any action involving a claim referred to in the preceding
paragraphs of this Section 6, such indemnified party will, if a claim in respect
thereof is made against an indemnifying party, give written notice to the latter
of the commencement of such action. The failure of any indemnified party to
notify an indemnifying party of any such action shall not (unless such failure
shall have a material adverse effect on the indemnifying party) relieve the
indemnified party on account of this Section 6. In case any such action is
brought against an indemnified party, the indemnifying party will be entitled to
participate in and to assume the defense thereof, jointly with any other
indemnifying party similarly notified to the extent that it may wish, with
counsel reasonably satisfactory to such indemnified party, and after notice from
the indemnifying party to such indemnified party of its election so to assume
the defense thereof, the indemnifying party shall not be responsible for any
legal or other expenses subsequently incurred by the indemnified party in
connection with the defense thereof; provided, however, that if any indemnified
party shall have reasonably concluded that there may be one or more legal or
equitable defenses available to such indemnified party which are additional to
or conflict with those available to the indemnifying party, or that such claim
or litigation involves or could have an effect upon matters beyond the scope of
the indemnity agreement provided in this Section 6, the indemnifying party shall
not have the right to assume the defense of such action on behalf of such
indemnified party (but shall have the right to participate therein with counsel
of its choice) and such indemnifying party shall reimburse such indemnified
party and any person controlling such indemnified party for that portion of the
fees and expenses of any counsel retained by the indemnified party which is
reasonably related to the matters covered by the indemnity agreement provided in
this Section 6. If the indemnifying party is not entitled to, or elects not to,
assume the defense of a claim, it will not be obligated to pay the fees and
expenses of more than one counsel with respect to such claim.

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<PAGE>

      (d) If the indemnification provided for in this Section 6 is held by a
court of competent jurisdiction to be unavailable to an indemnified party with
respect to any loss, claim, damage, liability or action referred to herein, then
the indemnifying party, in lieu of indemnifying such indemnified party
hereunder, shall contribute to the amounts paid or payable by such indemnified
party as a result of such loss, claim, damage, liability or action in such
proportion as is appropriate to reflect the relative fault of the indemnifying
party on the one hand and of the indemnified party on the other in connection
with the statements or omissions which resulted in such loss, claim, damage,
liability or action as well as any other relevant equitable considerations. The
relative fault of the indemnifying party and of the indemnified party shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the indemnifying party or by
the indemnified party and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The parties agree that it would not be just and equitable if contribution
pursuant hereto were determined by pro rata allocation or by any other method or
allocation which does not take account of the equitable considerations referred
to herein. No person guilty of fraudulent misrepresentation shall be entitled to
contribution from any person.

                                   SECTION 7
                             EXCHANGE ACT COMPLIANCE

      From the Registration Date or such earlier date as a registration
statement filed by the Corporation pursuant to the Exchange Act relating to any
class of the Corporation's securities shall have become effective, the
Corporation shall comply with all of the reporting requirements of the Exchange
Act applicable to it (whether or not it shall be required to do so, but
specifically excluding Section 14 of the Exchange Act if not then applicable to
the Corporation) and shall comply with all other public information reporting
requirements of the Commission which are conditions to the availability of Rule
144 for the sale of the Common Stock. The Corporation shall cooperate with the
Investor in supplying such information as may be necessary for the Investor to
complete and file any information reporting forms presently or hereafter
required by the Commission as a condition to the availability of Rule 144.

                                   SECTION 8
                              NO CONFLICT OF RIGHTS

      The Corporation shall not, after the date hereof, grant any registration
rights which conflict with or impair the registration rights granted hereby. In
the event the Corporation grants to any person any registration rights that are
superior in scope or substance to the registration rights granted to the holders
of the Registrable Shares, such superior rights shall be simultaneously granted
to such holders.

                                   SECTION 9
                                   TERMINATION

      This Agreement shall terminate and be of no further force or effect when
there shall no longer be any Registrable Shares outstanding; provided that
Sections 5 and 6 shall survive any termination of this Agreement.

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<PAGE>

                                   SECTION 10
                             SUCCESSORS AND ASSIGNS

      This Agreement shall bind and inure to the benefit of the Corporation and
the Investor and, subject to Section 11, the respective successors and assigns
of the Corporation and the Investor.

                                   SECTION 11
                                   ASSIGNMENT

      The Investor may assign its rights hereunder to any purchaser or
transferee of Registrable Shares; provided, however, that such purchaser or
transferee shall, as a condition to the effectiveness of such assignment, be
required to execute a counterpart to this Agreement agreeing to be treated as an
Investor whereupon such purchaser or transferee shall have the benefits of, and
shall be subject to the restrictions contained in, this Agreement as if such
purchaser or transferee was originally included in the definition of an Investor
herein and had originally been a party hereto

                                   SECTION 12
                                ENTIRE AGREEMENT

      This Agreement and the other writings referred to herein or therein or
delivered pursuant hereto or thereto, contain the entire agreement between the
Investor and the Corporation with respect to the subject matter hereof and
supersede all prior and contemporaneous arrangements or understandings with
respect thereto.

                                   SECTION 13
                                     NOTICES

      All notices, requests, consents and other communications hereunder to any
party shall be deemed to be sufficient if contained in a written instrument
delivered in person or sent by telecopy, nationally-recognized overnight courier
or first class registered or certified mail return receipt requested, postage
prepaid, addressed to such party at the address set forth below or such other
address as may hereafter be designated in writing by such party to the other
parties:

      If sent to the Investor, notices shall be sent to the following address:
      SG Phoenix Ventures LLC
      110 East 59th Street, Suite 1901
      New York, New York 10022
      Attention:  Andrea Goren
      Fax: (212) 202-7565

      With a copy to:

      Brown Raysman Millstein Felder & Steiner LLP
      900 Third Avenue
      New York, New York 10022
      Attn:  Joel H. Handel, Esq.
      Fax: (212) 895-2900

      If sent to the Corporation, notice shall be sent to the following address:

                                      11
<PAGE>

      Datametrics Corporation
      1717 Diplomacy Row
      Orlando, FL 32809
      Attention:  Daniel Bertram, President
      Fax: (407) 251-4588

      With a copy to:

      McLaughlin & Stern LLP
      260 Madison Avenue
      New York, New York 10016
      Attn: Steven Schuster, Esq.
      Fax: (212) 448-0066

      All such notices, requests, consents and other communications shall be
deemed to have been delivered (a) in the case of personal delivery or delivery
by telecopy, on the date of such delivery, (b) in the case of dispatch by
nationally-recognized overnight courier, on the next business day following such
dispatch and (c) in the case of mailing, on the third business day after the
posting thereof.

                                   SECTION 14
                       MODIFICATIONS; AMENDMENTS; WAIVERS

      The terms and provisions of this Agreement may not be modified or amended,
nor may any provision be waived, except pursuant to a writing signed by the
Corporation and the holders of at least a majority of the Registrable Shares
then outstanding. Any amendment or waiver effected in accordance with this
paragraph shall be binding upon the Investor, each holder and the Corporation.
The failure of any party to exercise any right or remedy under this Agreement or
otherwise, or the delay by any party in exercising such right or remedy, shall
not operate as a waiver thereof.

                                   SECTION 15
                                  COUNTERPARTS

      This Agreement may be executed in any number of counterparts, and each
such counterpart hereof shall be deemed to be an original instrument, but all
such counterparts together shall constitute but one agreement.

                                   SECTION 16
                                    HEADINGS

      The headings of the various sections of this Agreement have been inserted
for convenience of reference only and shall not be deemed to be a part of this
Agreement.

                            [Signature Page Follows]

                                      12
<PAGE>
                                   SECTION 17
                                  GOVERNING LAW

      This Agreement shall be governed by and construed in accordance with the
laws of the State of New York applicable to contracts made and to be performed
wholly therein.

                                      13
<PAGE>

      IN WITNESS WHEREOF, the undersigned have executed and delivered this
Agreement as of the date first set forth above.

                                    DATAMETRICS CORPORATION

                                    By: /s/ Daniel Bertram
                                       -------------------
                                    Name:  Daniel Bertram
                                    Title:    Chief Executive Officer

                                    SG DMTI Capital LLC

                                        By: SG Phoenix Ventures LLC
                                        its Managing Member

                                            By: /s/ Philip S. Sassower
                                              ------------------------
                                            Name: Philip S. Sassower
                                            Title: Member

                                            By: /s/ Andrea Goren
                                                -----------------
                                            Name: Andrea Goren
                                            Title: Member

                                      14EXHIBIT 10.35

THIS NOTE HAS NOT BEEN  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE  "SECURITIES  ACT"), OR ANY APPLICABLE STATE SECURITIES LAWS AND MAY NOT BE
SOLD OR OTHERWISE  TRANSFERRED OR PLEDGED BY ANY PERSON, UNLESS (1) EITHER (A) A
REGISTRATION  WITH RESPECT  THERETO SHALL BE EFFECTIVE UNDER THE SECURITIES ACT,
OR (B) THE COMPANY SHALL HAVE RECEIVED AN OPINION OF COUNSEL SATISFACTORY TO THE
COMPANY  THAT  AN  EXEMPTION  FROM  REGISTRATION  UNDER  THE  SECURITIES  ACT IS
AVAILABLE,  AND (2) THERE SHALL HAVE BEEN COMPLIANCE  WITH ALL APPLICABLE  STATE
SECURITIES OR "BLUE SKY" LAWS.

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

                    DATAMETRICS CORPORATION

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

                                                               December 30, 2005

                                                                        $500,000

                             Secured Promissory Note

      Datametrics Corporation ("Borrower"),  for value received, hereby promises
to pay to the  order of SG DMTI  CAPITAL,  LLC,  a  Delaware  limited  liability
company ("Payee"), the principal sum of FIVE HUNDRED THOUSAND DOLLARS ($500,000)
(the "Principal Amount"),  together with interest on the unpaid Principal Amount
from the date of this Note to December 31, 2006 (the "Maturity  Date"), at a per
annum rate equal to 10 percent (10%), in lawful money of the United States.

      1. Payment Terms.

            A. Mandatory.  The Principal Amount of this Note shall be payable at
the  Maturity  Date or  earlier  upon the  occurrence  of an  Event  of  Default
hereunder.  Any and all interest  accrued and unpaid thereon shall be payable in
four quarterly  installments and for the first time on March 31, 2006 or earlier
upon the  occurrence  of an Event  of  Default  hereunder.  Accrued  and  unpaid
interest  shall  commence on the date hereof and be payable upon each  quarterly
installment  and after the  Maturity  Date until paid in full  (after as well as
before judgment), on demand. All payments by Borrower hereunder shall be applied
first to pay any  interest  that is due,  but  unpaid,  and then to  reduce  the
Principal Amount.

            B. Optional. This Note can be prepaid, in whole or in part, with the
prior written consent of Payee.

<PAGE>

            C. No Right to Set-Off or  Counterclaim.  Each  payment by  Borrower
pursuant to this Note shall be made without set-off or counterclaim and shall be
made in lawful  currency  of the  United  States of America  and in  immediately
available funds.

            D. Waiver of  Presentment/Payment of Legal Fees. Borrower (i) waives
presentment,  demand, protest or notice of any kind in connection with this Note
and (ii) agrees to pay to the holder hereof,  on demand,  all costs and expenses
(including  reasonable legal fees and expenses)  incurred in connection with the
preparation, enforcement and collection of this Note.

      2. Interest.

            A. Interest.  The Principal  Amount shall accrue  interest at a rate
equal to ten percent (10 %) per annum.

            B.  Calculation and Payment.  Interest on the Principal Amount shall
be calculated on the basis of a three hundred  sixty-five (365) day year for the
actual number of days elapsed.

            C.  Default Rate of  Interest.  At the election of Payee,  after the
occurrence of an Event of Default and for so long as it continues, the Principal
Amount shall bear interest as set forth in Section 2.A above, plus 8% per annum.

            D. Excess  Interest.  Notwithstanding  anything to the  contrary set
forth herein, the aggregate interest, fees and other amounts required to be paid
by Borrower to Payee are hereby  expressly  limited so that in no contingency or
event whatsoever, whether by reason of acceleration of maturity of the Principal
Amount  or  otherwise,  shall  the  amount  paid or  agreed  to be paid to Payee
hereunder exceed the maximum  permissible under applicable law. If under or from
any circumstances whatsoever, fulfillment of any provision hereunder at the time
of performance of such provision shall be due, shall involve exceeding the limit
permitted by applicable law, then the Principal  Amount shall  automatically  be
reduced to the limit permitted,  and if under or from  circumstances  whatsoever
Payee  should ever receive as interest any amount which would exceed the highest
lawful rate,  the amount of such interest that is excessive  shall be applied to
the reduction of the Principal Amount and not to the payment of interest. In the
event  of a  conflict,  this  provision  shall  control  every  other  provision
hereunder.

      3. Representations of Borrower. Borrower hereby represents to Payee that:

            A. Borrower is a corporation duly organized, validly existing and in
good  standing  under the laws of the State of  Delaware  and has full power and
authority to conduct its business as presently  conducted  and as proposed to be
conducted by it.

            B. Borrower has the corporate  power and capacity to enter into this
Note, and to do all acts and things as are required or contemplated hereunder to
be done,  observed  and  performed  by it.  Borrower  has  taken  all  necessary
corporate action to authorize the execution, delivery and performance of each of
this Note.

            C. The  execution and delivery of this Note and the  performance  by
Borrower  of its  obligations  hereunder  (i) does not and will not  contravene,
breach  or  result  in  any  default  under  (A)  the  articles,  memorandum  of
association,  by-laws, constating documents or other organizational documents of
Borrower, or (B) under any mortgage,  lease,  agreement or other legally binding
instrument, license, permit or applicable law to which Borrower is a party or by
which  Borrower or any of its  properties or assets may be bound,  (ii) will not
oblige Borrower to grant any encumbrance to any person other than to Payee,  and
(iii) will not  result in or permit  the  acceleration  of the  maturity  of any
indebtedness,  liability or  obligation of Borrower  under any mortgage,  lease,
agreement or other legally binding instrument of or affecting Borrower.

                                       2
<PAGE>

      4. Events of Default.  Upon the occurrence of any of the following  events
(each an "Event of Default"), the entire unpaid principal of this Note, together
with all accrued interest hereon,  shall become immediately due and payable, and
Payee shall be entitled to pursue all remedies that Payee may have, at law or in
equity, for the enforcement and collection hereof:

            A. The failure of  Borrower to make (i) any payment of all  interest
due on this Note on each  quarterly  installment  and (ii) full  payment  of all
interest and principal due on this Note on the Maturity Date; or

            B. Borrower  shall make an assignment  for the benefit of creditors,
file a petition in  bankruptcy,  consent to entry of an order for relief against
it in an  involuntary  case, be adjudicated  insolvent or bankrupt,  petition or
apply to any tribunal for the  appointment  of any receiver,  trustee or similar
official for it or a substantial part of its assets, or commence any proceedings
under  any  bankruptcy,  reorganization,   arrangement,  readjustment  of  debt,
dissolution or liquidation  law or statute of any  jurisdiction,  whether now or
hereafter in effect;  there shall occur the appointment of a receiver,  trustee,
assignee, liquidator,  custodian or similar official of it or a substantial part
of  Borrower's  assets;  or there  shall  have been filed any such  petition  or
application or any such proceeding shall have been commenced  against  Borrower,
which remains  undismissed for a period of sixty (60) days or more;  Borrower by
any act or omission  shall indicate its  respective  consent to,  approval of or
acquiescence in any such petition,  application or proceeding or the appointment
of any  trustee  for  it or  any  substantial  part  of  any  of its  respective
properties; or

            C. A court of competent  jurisdiction shall enter an order or decree
under any bankruptcy  law that is for relief against  Borrower in an involuntary
case, appoints a receiver, trustee, assignee,  liquidator or similar official of
Borrower,  or for any  substantial  part of Borrower's  property,  or orders the
liquidation of Borrower;  and the order or decree remains unstayed and in effect
for thirty (30) days.

            D. The  occurrence  of a default in any  covenant  or  agreement  or
breach of any  representation  or warranty under any present or future document,
instrument  or agreement  between  Borrower  and Payee which,  with respect to a
default  of a  covenant  or  agreement,  is not cured  within  the grace  period
applicable thereto, if any, or if no grace period is designated and such default
is capable of cure, remains uncured for more than thirty (30) days following its
occurrence.

            E. A court of  competent  jurisdiction  shall enter into a judgment,
order or decree against Borrower for an amount of $25,000 or more.

                                       3
<PAGE>

      5.  Acceleration.  Upon the occurrence of an Event of Default,  the unpaid
Principal  Amount  and  accrued  interest  thereon  shall  automatically  become
immediately due and payable,  without presentment,  demand,  protest,  notice of
intent to accelerate,  notice of acceleration or other requirements of any kind,
all of which are hereby expressly waived by Borrower.

      6. Amendments and Waivers.

            A. The  provisions  of this Note may from  time to time be  amended,
modified or waived, if such amendment,  modification or waiver is in writing and
consented to by Borrower and Payee.

            B. No failure or delay on the part of Payee in exercising  any power
or right under this Note shall operate as a waiver thereof, nor shall any single
or partial  exercise  of any such power or right  preclude  any other or further
exercise  thereof or the  exercise of any other power or right.  No notice to or
demand on  Borrower  in any case  shall  entitle  it to any  notice or demand in
similar or other circumstances.  No waiver or approval by Payee shall, except as
may be otherwise stated in such waiver or approval,  be applicable to subsequent
transactions.  No waiver or  approval  hereunder  shall  require  any similar or
dissimilar waiver or approval thereafter to be granted hereunder.

            C. To the extent that Borrower makes a payment or payments to Payee,
and such payment or payments or any part thereof are subsequently for any reason
invalidated,  set aside and/or  required to be repaid to a trustee,  receiver or
any other party under any bankruptcy  law,  state or federal law,  common law or
equitable  cause,  then to the extent of such  recovery,  the obligation or part
thereof  originally  intended  to be  satisfied,  and all  rights  and  remedies
therefor,  shall be revived  and  continued  in full force and effect as if such
payment had not been made or such enforcement or setoff had not occurred.

      7. Miscellaneous.

            A.  Governing  Law.  This Note shall be governed by and construed in
accordance  with  the laws of the  State  of New  York,  without  regard  to its
principles  of  conflicts  of law.  Sections  5-1401 and  5-1402 of the  General
Obligations  Law of the State of New York shall apply to this Note and  Borrower
hereby waives any right to stay or dismiss on the basis of forum non  conveniens
any  action or  proceeding  brought  before  the courts of the State of New York
sitting in New York County or of the United  States of America for the  Southern
District of New York and hereby submits to the jurisdiction of such courts.

            B.  Notices.  Unless  otherwise  provided,  all notices  required or
permitted  under this Note shall be in writing  and shall be deemed  effectively
given (i) on the day delivered or transmitted to the party to be notified in the
case of notices delivered by hand or by facsimile, (in the event confirmation is
received) (ii) upon confirmed  delivery by Federal  Express or other  nationally
recognized courier service providing  next-business-day delivery, or (iii) three
business days after deposit with the United States Postal Service, by registered
or certified mail, postage prepaid and addressed to the party to be notified, in
each case at the address set forth below, or at such other address as such party
may  designate  by written  notice to the other party  (provided  that notice of
change of  address  shall be  effective  upon  receipt by the party to whom such
notice is addressed).

                                       4
<PAGE>

             If sent to Payee, notices shall be sent to the following address:

             SG Phoenix Ventures LLC
             110 East 59th Street, Suite 1901
             New York, New York 10022
             Attention:  Mr. Andrea Goren
             Fax: (212) 202-7565

             With a copy to:

             Brown Raysman Millstein Felder & Steiner LLP
             900 Third Avenue
             New York, New York 10022
             Attn:  Joel H. Handel, Esq.
             Fax: (212) 895-2900

             If sent to Borrower, notice shall be sent to the following address:

             Datametrics Corporation
             1717 Diplomacy Row
             Orlando, FL 32809
             Attention:  Daniel Bertram, President
             Fax: (407) 251-4588

             With a copy to:

             McLaughlin & Stern LLP
             260 Madison Avenue
             New York, New York 10016
             Attn: Steven Schuster, Esq.
             Fax: (212) 448-0066

            C.  Waiver of Jury  Trial.  PAYEE  AND  BORROWER  HEREBY  KNOWINGLY,
VOLUNTARILY AND INTENTIONALLY  WAIVE ANY RIGHTS THEY MAY HAVE TO A TRIAL BY JURY
IN RESPECT OF ANY  LITIGATION  BASED  HEREON,  OR ARISING OUT OF,  UNDER,  OR IN
CONNECTION  WITH,  THIS NOTE OR ANY OTHER  DOCUMENT OR  INSTRUMENT  EXECUTED AND
DELIVERED IN CONNECTION HEREWITH,  OR ANY COURSE OF CONDUCT,  COURSE OF DEALING,
STATEMENTS  (WHETHER VERBAL OR WRITTEN),  OR ACTIONS OF PAYEE OR BORROWER.  THIS
PROVISION IS A MATERIAL INDUCEMENT FOR PAYEE'S PURCHASING THIS NOTE.

      8. Security.

                                       5
<PAGE>

            A. Creation of Security Interest.  In order to secure the payment of
the  principal  and  interest and all other  obligations  of the Borrower now or
hereafter  owed by the Borrower to the Payee (the  "Secured  Obligations"),  the
Borrower  hereby grants to the Payee (or its designee)  (the "Secured  Party") a
security  interest in all of the personal  property of the  Borrower,  including
without limitation the personal property described below (the "Collateral"):

                  (i) all equipment in all of its forms,  wherever located,  now
or hereafter existing, all parts thereof and all accessions thereto;

                  (ii) all inventory in all of its forms,  wherever located, now
or hereafter existing,  including, but not limited to, (A) all raw materials and
work in process therefor, finished goods thereof, and materials used or consumed
in the manufacture or production thereof; (B) goods in which the Borrower has an
interest in mass or a joint or other  interest or right of any kind  (including,
without  limitation,  goods in which the  Borrower  has an  interest or right as
consignee);  and (C) goods which are returned to or  repossessed by the Borrower
and all accessions thereto and products thereof and documents therefor;

                  (iii) all  accounts,  accounts  receivable,  contract  rights,
chattel paper, documents,  instruments,  deposit accounts,  general intangibles,
tax  refunds and other  obligations  of any kind owing to the  Borrower,  now or
hereafter existing, whether or not arising out of or in connection with the sale
or lease of goods or the rendering of services,  and all rights now or hereafter
existing  in  and to all  security  agreements,  leases,  subleases,  and  other
contracts securing or otherwise relating to any such accounts,  contract rights,
chattel paper, documents, instruments, deposit accounts, general intangibles, or
obligations;

                  (iv)  all   intellectual   property  of  any  kind  or  nature
whatsoever,   including  without  limitation   patents,   patent   applications,
copyrights,   copyright   applications,   trademarks   and  service   marks  and
applications therefore, mask works, net lists and trade secrets;

                  (v) all other  general  intangibles,  whether now  existing or
hereafter arising and wherever arising,  including,  but not limited to, all (A)
partnership,  corporate, and other interests in and to any person or entity; (B)
letters  of  authorization,   permits,  licenses,   consents,  contract  rights,
franchises,  documents,  certificates,  records,  customer  lists,  customer and
supplier  contracts,  easements,  variances,  certifications  and  approvals  of
tribunals, bills of lading (negotiable and non-negotiable),  warehouse receipts,
any claim of the Borrower against any lender,  liquidated or  unliquidated,  and
other rights,  privileges and goodwill  obtained or used in connection  with any
property of the Borrower; (C) rights of the Borrower under any equipment leases;
and (D) tax refunds  and other  refunds or rights to receive  payment  from U.S.
federal, state or local governments or foreign governments or other tribunals;

                  (vi) all bank accounts, deposit accounts, and margin accounts,
maintained by the Borrower with financial  institutions,  brokers,  dealers, and
all other  persons  or  entities  relating  to  commodities  and/or  securities,
including all funds held therein and all certificates  and instruments,  if any,
from time to time representing or evidencing such accounts;

                  (vii) all investment  property (as defined in Section 9-115 of
the New York Uniform Commercial Code);

                                       6
<PAGE>

                  (viii) to the  extent  it is  possible  to  create a  security
interest  or perfect a security  interest in such  Collateral  by filing a UCC-1
financing statement centrally,  or in the case of dual filing states,  centrally
and at the county  level,  as  applicable,  all of the  Borrower's  fixtures now
existing or hereafter acquired,  all substitutes and replacements  therefor, all
accessions and attachments  thereto,  and all tools, parts, and equipment now or
hereafter  added to or used in connection with the fixtures on or above all real
property now owned or hereafter acquired by the Borrower;

                  (ix) all records and documents  relating to any and all of the
foregoing,  including,  without limitation,  records of account,  whether in the
form of writing, microfilm, microfiche, tape, or electronic media; and

                  (x)  all  substitutes  and   replacements   for,   accessions,
attachments,  and  other  additions  to  tools,  parts,  and  equipment  used in
connection  with, and all proceeds,  products,  and increases of, any and all of
the foregoing Collateral,  in whatever form, whether cash or noncash;  interest,
premium,  and principal payments,  redemption proceeds and subscription  rights,
and shares or other  proceeds  of  conversions  or splits of any  securities  in
Collateral,  and  returned  or  repossessed  Collateral;  and, to the extent not
otherwise included, all (A) payments under insurance, or any indemnity, warranty
or guaranty, payable by reason of loss or damage to or otherwise with respect to
any of the  foregoing  Collateral,  (B) cash and (C) security for the payment of
any of the Collateral,  and all goods which gave or will give rise to any of the
Collateral or are evidenced, identified, or represented therein or thereby.

            B. Sale or Removal of Collateral Prohibited.  Except for the sale of
inventory in the ordinary course of the Borrower's business,  the Borrower shall
not sell, lease, encumber,  pledge, mortgage,  assign, grant a security interest
in, or otherwise  transfer  the  Collateral  without the written  consent of the
Payee, which consent shall not be unreasonably withheld.

            C.  Uniform  Commercial  Code  Security  Agreement.  This Section is
intended to be a security  agreement pursuant to the Uniform Commercial Code for
any  of the  items  specified  above  as  part  of the  Collateral  that,  under
applicable  law, may be subject to a security  interest  pursuant to the Uniform
Commercial Code, and the Borrower hereby grants the Payee a security interest in
said items. The Borrower agrees that the Payee may file any appropriate document
in the appropriate index as a financing statement for any of the items specified
above as part of the Collateral. In addition, the Borrower agrees to execute and
deliver to the Payee,  upon the Payee's request,  any financing  statements,  as
well as extensions,  renewals and amendments thereof,  and reproductions of this
Note in such form as the Payee may  reasonably  require  to  perfect a  security
interest with respect to said items.  The Borrower shall pay all costs of filing
such financing statements and any extensions, renewals, amendments, and releases
thereof,  and shall pay all reasonable costs and expenses of any record searches
for financing  statements  the Payee may reasonably  require.  Without the prior
written  consent of the  Payee,  the  Borrower  shall not create or suffer to be
created pursuant to the Uniform  Commercial Code any other security  interest in
the Collateral,  other than the Security Interests of Secured Party and existing
secured creditors. Upon the occurrence of an Event of Default, the Secured Party
shall have the  remedies of a holder under the Uniform  Commercial  Code and, at
Secured Party's option, may also invoke the other remedies provided in this Note
as to such items.  In  exercising  any of said  remedies,  the Secured Party may
proceed  against the items of real  property and any items of personal  property
specified  above as part of the  Collateral  separately  or together  and in any
order  whatsoever,  without in any way affecting the availability of the Secured
Party's  remedies  under the Uniform  Commercial  Code or of the other  remedies
provided in this Note.

                                       7
<PAGE>

            D. Rights of Secured Party.

                  (i) Upon an Event of Default,  the  Secured  Party may require
the  Borrower to assemble  the  Collateral  and make it available to the Secured
Party at the place to be  designated  by the  Secured  Party that is  reasonably
convenient  to the  parties.  The Secured  Party may sell all or any part of the
Collateral as a whole or in parcels either by public  auction,  private sale, or
other method of disposition. The Secured Party may bid at any public sale on all
or any  portion  of the  Collateral.  Unless the  Collateral  is  perishable  or
threatens to decline  speedily in value or is of the type  customarily sold on a
recognized market,  the Secured Party shall give the Borrower  reasonable notice
of the time and place of any public  sale or of the time after which any private
sale or other  disposition  of the Collateral is to be made, and notice given at
least  10 days  before  the  time of the  sale or  other  disposition  shall  be
conclusively presumed to be reasonable.

                  (ii)  Notwithstanding  any  provision of this  Agreement,  the
Secured Party shall be under no obligation to offer to sell the  Collateral.  In
the event the Secured  Party offers to sell the  Collateral,  the Secured  Party
will be under no obligation to consummate a sale of the  Collateral if, in their
reasonable  business  judgment,  none of the offers  received by them reasonably
approximates the fair value of the Collateral.

                  (iii) In the event the  Secured  Party  elects not to sell the
Collateral,  the Secured Party may elect to follow the  procedures  set forth in
the Uniform  Commercial Code for retaining the Collateral in satisfaction of the
Borrower's obligation, subject to the Borrower's rights under such procedures.

                  (iv) In addition to the rights  under this  Agreement,  in the
Event of Default by the  Borrower,  the  Secured  Party shall be entitled to the
appointment of a receiver for the Collateral as a matter of right whether or not
the apparent value of the Collateral exceeds the outstanding principal amount of
the Notes and any receiver  appointed may serve without bond.  Employment by the
Secured Party shall not disqualify a person from serving as receiver.

                            [Signature Page Follows]

                                       8
<PAGE>

      IN WITNESS WHEREOF, Borrower has caused this Note to be signed in its name
by its duly authorized officer.

                                          DATAMETRICS CORPORATION

                                          By:   /s/ Daniel Bertram
                                             --------------------------
                                                Name:  Daniel Bertram
                                                Title: Chief Executive Officer

                                       9

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