Document:

<PAGE>
Exhibit 10.27.11

                                 [EUROTECH logo]

July 24, 2002

Mr. Robert Tarini
President
Trylon Metrics Inc.

Re:      Eurotech, Ltd.

Dear Mr. Tarini:

With reference to a certain Technology Transfer Agreement by and between
Eurotech, Ltd. ("Eurotech") and Trylon Metrics, Inc. ("Trylon") dated as of July
13, 2001, as amended (the "TTA"), this Letter Agreement shall serve as a limited
amendment of the TTA. Specifically, this Letter Agreement confirms the
understanding that Eurotech shall pay to Trylon's designee, ipPartners Inc.
("ipPartners") $12,500 per month, in cash to ipPartners until December 2002 for
technical and marketing services provided by ipPartners. These payments shall be
made in arrears on or before the 15th day of each month. The TTA, which expired
July 13, 2002, shall be deemed extended by this Letter Agreement for an
additional period until December 13, 2002. All other terms and conditions of the
TTA shall remain unchanged by this Letter Agreement.

If the above comports with your understanding, please sign below.

                                                     Sincerely,

                                                     EUROTECH, LTD.

                                                     By: /S/ TODD J. BROMS
                                                         -----------------------
                                                             Todd J. Broms
                                                             President and CEO
AGREED AND ACCEPTED
AS OF THE DATE OF THIS LETTER:

Trylon Metrics, Inc.

By: /S/ ROBERT TARINI
    ---------------------
        Robert Tarini
        President<PAGE>
Exhibit 10.27.12

                                [EUROTECH logo]

July 24, 2002

IpPartners, Inc
P.O. Box 1490
Coventry, Rhode Island 02816
Attn: Robert Tarini, President

Re:      Eurotech, Ltd.

Dear Mr. Tarini:

With reference to a certain Consulting Agreement by and between Eurotech, Ltd.
("Eurotech") and Robert Tarini ("Tarini")/ipPartners, Inc. ("ipPartners") dated
as of March 23, 2001 to be effective as of February 14, 2001 (the "Tarini
Consulting Agreement"), this Letter Agreement shall serve as a limited amendment
of the Tarini Consulting Agreement. Specifically, this Letter Agreement confirms
the understanding that Eurotech shall pay to Tarini's designee, ipPartners
$5,000 per month, in cash, to ipPartners until December 2002 for marketing
technical and marketing services provided by ipPartners and Tarini. These
payments shall be made in arrears on or before the 15th day of each month. The
Tarini Consulting Agreement, which expired February 14, 2002, shall be deemed
extended by this Letter Agreement for an additional period until December 13,
2002. Additionally, it is understood that there are no additional payments due
for the period from February 14, 2002 until July 31, 2002 beyond those that have
already been made by Eurotech. All other terms and conditions of the
Tarini/ipPartners Inc Consulting Agreement shall remain unchanged by this Letter
Agreement.

If the above comports with your understanding, please sign below.

Sincerely,

EUROTECH, LTD.

By: /S/ TODD J. BROMS
    -----------------------
Todd J. Broms
President and CEO

AGREED AND ACCEPTED
AS OF THE DATE OF THIS LETTER:

ipPartners, Inc.

By:  /S/ ROBERT TARINI
     ----------------------
         Robert Tarini
         President

Robert Tarini, Individually

/S/ ROBERT TARINI
---------------------------
Robert Tarini<PAGE>
Exhibit 10.27.13

                            JOINT ESCROW INSTRUCTIONS

                                                              July 30, 2002

Richard Walsh III, Esq.
6310 Post Road
North Kingstown, RI 02852

Gentlemen:

         This letter sets forth the terms by which Richard Walsh III Esq. (the
"Escrow Agent") would agree to act as the escrow agent for Eurotech, Ltd., a
District of Columbia corporation (the "Company") in respect of the Escrow Shares
(as defined below). The Escrow Agent is hereby authorized and directed to hold
those shares of Common Stock of the Company (the "Escrow Shares"), received by
the Company pursuant to the terms of a certain Technology Development Agreement
by and between the Company and ipPartners Inc. (the "Consultant") dated as of
July 24, 2002 (the "TDA"). The Escrow Shares shall be delivered to the Escrow
Agent upon execution of the TDA. The Escrow Agent, the Company and the
Consultant may be herein after referred to collectively as the "Parties".
Capitalized terms not otherwise defined herein shall have those respective
meanings ascribed to them in the TDA

         The Escrow Shares shall be held, and the Escrow Agent shall undertake
its obligations in accordance with the following terms and conditions:

         1.       The Parties hereto acknowledge receipt by the Escrow Agent of
                  2,000,000 shares of the Company's Common Stock, issued to
                  ipPartners Inc. subject to those restrictions and provisions
                  more fully described in Section 9 of the TDA with fully
                  executed stock powers and authority to transfer the Escrow
                  Shares.

         2.       It is further acknowledged by the parties that these Escrow
                  Shares are subject to forfeiture by the Consultant under the
                  following conditions:

                  (a)      On October 15, 2002, if the Company has notified the
                           Escrow Agent via certified mail that: 1) the
                           Consultant has not completed the prototype assemblies
                           and 2) the device's capabilities to acquire acoustic
                           data for testing of the APTIS Project have not been
                           demonstrated; then seven hundred fifty thousand
                           (750,000) of the Escrow Shares are forfeited and
                           shall be returned, transferred or otherwise assigned
                           to the Treasury of the Company.

                                       1
<PAGE>

                  (b)      On January 15, 2003, if the Company has notified the
                           Escrow Agent via certified mail that: 1) the
                           Consultant has not completed the prototype assemblies
                           and 2) the device's capabilities to acquire acoustic
                           data for testing of the Hand Held Project have not
                           been demonstrated; then seven hundred fifty thousand
                           (750,000) of the Escrow Shares are forfeited and
                           shall be returned, transferred or otherwise assigned
                           to the Treasury of the Company.

                  (c)      On January 15, 2003, if the Company has notified the
                           Escrow Agent via certified mail that: the Consultant
                           has not completed and demonstrated to the Company the
                           prototype of the APTIS Project; then two hundred
                           fifty thousand (250,000) of the Escrow Shares are
                           forfeited and shall be returned, transferred or
                           otherwise assigned to the Treasury of the Company.

                  (d)      On March 15, 2003, if the Company has notified the
                           Escrow Agent via certified mail that: the Consultant
                           has not completed and demonstrated the prototype of
                           the Hand Held device: then two hundred fifty thousand
                           (250,000) shares are forfeited and shall be returned,
                           transferred or otherwise assigned to the Treasury of
                           the Company.

                         It is further acknowledged by the parties that these
         Escrow Shares are to be promptly released by the Escrow Agent and
         returned to the Consultant under the following conditions:

                  (e)      If by October 15, 2002, the Company has not notified
                           the Escrow Agent via certified mail that: 1) the
                           Consultant has not completed the prototype assemblies
                           and 2) the device's capabilities to acquire acoustic
                           data for testing of the APTIS Project have not been
                           demonstrated; then seven hundred fifty thousand
                           (750,000) of the Escrow Shares shall be released by
                           the Escrow Agent and returned to the Consultant.

                  (f)      If by January 15, 2003, the Company has not notified
                           the Escrow Agent via certified mail that: 1) the
                           Consultant has not completed the prototype assemblies
                           and 2) the device's capabilities to acquire acoustic
                           data for testing of the Hand Held Project have not
                           been demonstrated; then seven hundred fifty thousand
                           (750,000) of the Escrow Shares shall be released by
                           the Escrow Agent and returned to the Consultant.

                                       2
<PAGE>

                  (g)      If by January 15,2003, the Company has not notified
                           the Escrow Agent via certified mail that: the
                           Consultant has not completed and demonstrated to the
                           Company the prototype of the APTIS Project; then two
                           hundred fifty thousand (250,000) of the Escrow Shares
                           shall be transferred to the Consultant.

                  (h)      If by March 15,2003, the Company has not notified the
                           Escrow Agent via certified mail that: the Consultant
                           has not completed and demonstrated the prototype of
                           the Hand Held device: then two hundred fifty thousand
                           (250,000) of the Escrow Shares shall be released by
                           the Escrow Agent and returned to the Consultant.

         3.       Those Escrow Shares, which shall be returned to the Treasury
                  of the Company, shall be referred to as the Forfeited Shares.

         4.       Upon a default of one of the above provisions which would
                  trigger a forfeiture of the Escrow Shares, the Company shall
                  provide to the Escrow Agent a written notice which shall be
                  (i) given to all Parties; (ii) shall be certified by the
                  President of the Company; (iii) shall specify the specific
                  nature of any default by the Consultant; and (iv) shall
                  include a representation to the Escrow Agent that all
                  applicable notice, right to cure and other applicable
                  provisions of the TDA have strictly followed with appropriate
                  evidence thereof (the "Written Notice of Forfeiture").

         5.       As promptly as feasible after receipt of a Written Notice of
                  Forfeiture from the Company, the Escrow Agent shall, after
                  payment of any Escrow Fees as described in Paragraph 6 below,
                  effectuate the return of the Forfeited Shares to the Treasury
                  of the Company provided that said forfeiture does not
                  otherwise conflict with any applicable Federal, State, SEC,
                  Amex statue, rule or regulation.

         6.       After receipt of a written notice of forfeiture the Company
                  and the Consultant, jointly and severally shall be responsible
                  for escrow fees (and any taxes payable thereon) made payable
                  to the Escrow Agent in the amount of $500.00 payable before
                  the processing of any Written Notice of Forfeiture (the
                  "Escrow Agent Fees").

         7.       Unless the Escrow Agent resigns in accordance with Paragraph 1
                  hereof, the Escrow Agent's duties hereunder may be altered,
                  amended, modified or revoked only by a writing signed by the
                  Company, the Consultant and the Escrow Agent.

                                       3
<PAGE>

         8.       The Escrow Agent shall be obligated only for the performance
                  of such duties as are specifically set forth herein and may
                  rely and shall be protected in relying or refraining from
                  acting on any instrument reasonably believed by the Escrow
                  Agent to be genuine and to have been signed or presented by
                  the proper party or parties. The Escrow Agent shall have no
                  obligation to verify the signatures of any party hereto. The
                  Escrow Agent shall not be personally liable for any act the
                  Escrow Agent may do or omit to do hereunder as the Escrow
                  Agent while acting in good faith, and any act done or omitted
                  by the Escrow Agent pursuant to the advice of the Escrow
                  Agent's attorneys-at-law (which may include its members) shall
                  be conclusive evidence of such good faith.

         9.       The Escrow Agent is hereby expressly authorized to disregard
                  any and all warnings given by any of the parties hereto or by
                  any other person or corporation, excepting only orders or
                  process of courts of law and is hereby expressly authorized to
                  comply with and obey orders, judgments or decrees of any
                  court. In case the Escrow Agent obeys or complies with any
                  such order, judgment or decree, the Escrow Agent shall not be
                  liable to any of the parties hereto or to any other person,
                  firm or corporation by reason of such decree being
                  subsequently reversed, modified, annulled, set aside, vacated
                  or found to have been entered without jurisdiction.

         10.      The Escrow Agent shall be entitled to employ such legal
                  counsel and other experts as the Escrow Agent may deem
                  necessary properly to advise the Escrow Agent in connection
                  with the Escrow Agent's duties hereunder, may rely upon the
                  advice of such counsel, and may pay such counsel reasonable
                  compensation therefore from the funds held in the Escrow
                  Account. The Company understands that the Escrow Agent is
                  relying explicitly on the foregoing provision in entering into
                  these Joint Escrow Instructions.

         11.      The Escrow Agent may resign by written notice to the Company
                  at any time and for any reason. In the event of any such
                  resignation, the Company shall appoint a successor escrow
                  agent within ten (10) business days and shall direct Escrow
                  Agent to pay all of the fund remaining in the Escrow Account,
                  less any fees and expenses to the successor agent. Should the
                  Company fail to do so, the Escrow Agent may commence an action
                  in any appropriate court and is authorized to transfer the
                  Escrow Shares into Court in accordance with Paragraph 13
                  hereof.

                                       4
<PAGE>

         12.      If the Escrow Agent reasonably requires other or further
                  instruments in connection with these Joint Escrow Instructions
                  or obligations in respect hereto, the necessary parties hereto
                  shall join in furnishing such instruments.

         13.      It is understood and agreed that should any dispute arise with
                  respect to the delivery and/or ownership or right of
                  possession of the Escrow Shares held by the Escrow Agent
                  hereunder, the Escrow Agent is authorized and directed in the
                  Escrow Agent's sole discretion (1) to retain in the Escrow
                  Agent's possession without liability to anyone all or any part
                  of the Escrow Shares until such disputes shall have been
                  settled either by mutual written agreement of the parties
                  concerned or by a final order, decree or judgment of a court
                  of competent jurisdiction after the time for appeal has
                  expired and no appeal has been perfected, but the Escrow Agent
                  shall be under no duty whatsoever to institute or defend any
                  such proceedings or (2) to deliver the Escrow Shares and any
                  other property and documents held by the Escrow Agent
                  hereunder to any state or federal court having competent
                  subject matter jurisdiction in accordance with the applicable
                  procedure therefore. The cost of any legal action required in
                  connection with any matter described in this paragraph shall
                  be for the account of the Company and shall be paid by the
                  Company and/or the Consultant who shall be jointly and
                  severally liable for such costs.

         14.      The Company and each individual director hereto agrees to
                  indemnify and hold harmless the Escrow Agent and each of its
                  partners, employees, and agents, from any and all claims,
                  liabilities, costs or expenses (including attorneys fees) in
                  any way arising from or relating to the duties or performance
                  of the Escrow Agent hereunder other than any such claim,
                  liability, cost or expense to the extent the same shall (a)
                  have been tax obligations in connection with Escrow Agent's
                  fee hereunder, or (b) have been determined by final,
                  unappealable judgment of a court of competent jurisdiction to
                  have resulted from the gross negligence or willful misconduct
                  of the Escrow Agent. The costs of defense of the Escrow Agent
                  shall be advanced by the Company and/or the Consultant who
                  shall be jointly and severally liable for such costs.

         15.      All notices to, demands, consents or communications which any
                  party may desire or may be required to give to the other must
                  be in writing, shall be effective upon receipt in the United
                  States after having been sent by registered or certified mail
                  or sent by facsimile transmission, and shall be effective upon
                  receipt outside the United States after having been delivered
                  prepaid to a reputable international delivery service or

                                       5
<PAGE>

                  courier or sent by facsimile transmission; and addressed to
                  the address of the party designated below. Receipt shall be
                  presumed on the date of proper transmission as to facsimile
                  transmission and otherwise within three (3) Days as to notices
                  given within the United States and ten (10) Days as to notices
                  given outside the United States.

                  For notice to the Company:
                  Eurotech, Ltd.
                  10306 Eaton Place
                  Suite 220
                  Fairfax, Virginia 22030
                  Attn:    President
                  Facsimile Number: (703) 352-5994

                  For notice to the Escrow Agent:

                  Richard L. Walsh III, 6310 Post Road, North Kingstown, RI
                  02852, (401) 884-9142 telephone number and fax number

                  For the Consultant

         16.      This instrument shall be binding upon and inure to the benefit
                  of the parties hereto, and their respective successors and
                  permitted assigns and shall be governed by the laws of the
                  State of New York without giving effect to principles
                  governing the conflicts of laws. Any action or proceeding
                  based upon any claim, dispute or difference arising hereunder
                  may be brought only in the courts of the State of New York or
                  the United States District Court for the Southern District of
                  New York. Each of the parties hereto submits to the
                  jurisdiction of such courts with respect to any such action or
                  proceeding and irrevocably and unconditionally waives, to the
                  fullest extent permitted by law, any objection which it may
                  now or hereafter have to the venue, or the convenience of the
                  forum, with respect to any such action or proceeding brought
                  in any of such courts. A facsimile transmission of these
                  instructions signed by the Escrow Agent shall be legal and
                  binding on all parties hereto.

         17.      Each party hereto acknowledges that they fully understand all
                  terms, conditions and implications of these Joint Escrow
                  Instructions.

                                       6
<PAGE>

         18.      The rights and obligations of any party hereto are not
                  assignable without the written consent of the other parties
                  hereto.

                                           THE COMPANY
                                           EUROTECH, LTD.

                                           /S/ TODD J. BROMS
                                           ---------------------------
                                           Todd J. Broms
                                           Chief Executive Officer and President

                                           CONSULTANT
                                           ipPARTNERS INC.

                                           /S/ ROBERT TARINI
                                           ---------------------------
                                           Name: Robert Tarini
                                           Title:    President

ACCEPTED BY ESCROW AGENT:

By:
    -----------------------------------
Date:

                                       7

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