Dated 23 May 2005


(1) AEROFLEX INCORPORATED


(2) UBINETICS HOLDINGS LIMITED




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                                DEED OF GUARANTEE

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                                     MAYER
                                     BROWN
                                     ROWE
                                     & MAW

                                     LONDON





                                    CONTENTS


CLAUSE                                                                  PAGE


1.  Definitions and Interpretation........................................1
2.  Guarantee.............................................................2
3.  Guarantor's Warranties................................................3
4.  General...............................................................4





THIS DEED is dated 23 May 2005 and made between:

(1)  AEROFLEX INCORPORATED a company incorporated in the State of Delaware whose
     registered office is at 35 South Service Road,  Plainview,  New York, 11803
     (the "GUARANTOR"); and

(2)  UBINETICS  HOLDINGS  LIMITED a company  incorporated  in England  and Wales
     (registered  number  03936291)  whose  registered  office  is at  Cambridge
     Technology Centre, Back Lane, Melbourn, Royston, Hertfordshire SG8 6DP (the
     "SELLER").

BACKGROUND:

(A)  Pursuant  to an  agreement  dated  the same day as this Deed  entered  into
     between  Aeroflex Test Solutions  Limited (the  "PURCHASER") and the Seller
     (the  "SALE  AGREEMENT"),  the Seller has agreed to sell the Shares and the
     Assets to the  Purchaser  on the terms and  conditions  set out in the Sale
     Agreement.

(B)  The Purchaser and the Guarantor are both members of the Purchaser's  Group.
     The Guarantor has agreed to guarantee certain  obligations of the Purchaser
     under the Sale Agreement on the terms and conditions set out in this Deed.

IT IS AGREED THAT:

1.        DEFINITIONS AND INTERPRETATION

1.1       DEFINITIONS

          In this Deed:

          "PROCEEDINGS" means any proceedings,  suit or action arising out of or
          in connection with this Deed; and

          "SERVICE DOCUMENT" means a claim form,  summons,  order,  judgement or
          other process  issued out of the courts of England and Wales  relating
          to or in connection with any Proceedings.

1.2       CONTENTS PAGE AND HEADINGS

          In this  Deed,  the  contents  page  and  headings  are  included  for
          convenience   only  and  shall  not  affect  the   interpretation   or
          construction of this Deed.

1.3       MEANING OF REFERENCES

          In this Deed, unless the context requires otherwise, any reference to:

          (a)  a CLAUSE is to a clause of this Deed;

          (b)  INDEMNIFY and to  INDEMNIFYING  any person  against any Losses by
               reference   to  a   matter,   event  or   circumstance   includes
               indemnifying  and keeping him  indemnified  immediately on demand
               against all Losses  from time to time


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          made,  suffered  or  incurred  by that  person as a direct or indirect
          result of that matter, event or circumstance;

          (c)  a PARTY or the  PARTIES is to a party or the parties to this Deed
               and shall include any permitted assignees of a party;

          (d)  a PERSON includes any  individual,  firm,  company,  corporation,
               government, state or agency of state or any association, trust or
               partnership (whether or not having a separate legal personality);
               and

          (e)  a STATUTE or STATUTORY  PROVISION  includes any  consolidation or
               re-enactment,  modification  or  replacement  of  the  same,  any
               statute or statutory  provision  of which it is a  consolidation,
               re-enactment,  modification  or replacement  and any  subordinate
               legislation  in force  under  any of the same  from  time to time
               except  to  the  extent  that  any  consolidation,  re-enactment,
               modification  or replacement  enacted after the date of this Deed
               would  extend or increase  the  liability  of either party to the
               other under this Deed.

1.4       NO RESTRICTIVE INTERPRETATION

          In  this  Deed,  general  words  shall  not  be  given  a  restrictive
          interpretation  by reason of their being preceded or followed by words
          indicating a particular class of acts, matters or things.

1.5       DEFINITIONS IN SALE AGREEMENT

          Words and expressions used but not defined in this Deed shall have the
          meanings given to them in the Sale Agreement.

2.        GUARANTEE

2.1       GUARANTEE

          If the  Purchaser  fails to comply with any  obligation to pay any sum
          when due to the Seller under the  provisions of the Sale  Agreement (a
          "PAYMENT  OBLIGATION")  then,  subject to the provisions of Clause 2.5
          (Right  to  defences),  the  Guarantor  guarantees  that it shall  (on
          written demand by the Seller)  immediately  perform and discharge such
          Payment Obligation.

2.2       CONTINUING GUARANTEE

          The guarantee set out in Clause 2.1 (Guarantee):

          (a)  is a  continuing  guarantee  and shall remain in force and effect
               until the Purchaser has  performed  and  discharged  each Payment
               Obligation under the Sale Agreement; and

          (b)  is additional to (and not in substitution for) any other security
               or  guarantee  which is or may be held by the Seller from time to
               time in respect of any Payment Obligation.


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2.3       NO RELEASE

          The Guarantor's  liability under Clause 2.1 (Guarantee) shall, subject
          to Clause 2.5 (Right to defences),  not be affected by any concession,
          time,  indulgence or release granted by the Seller to the Purchaser or
          by any  payment  or other  dealing or  anything  else  (whether  by or
          relating to the Seller,  any  co-guarantor  or any other person) which
          would,  but for this Clause 2.3,  operate to  discharge or reduce that
          liability.

2.4       INVALIDITY OR UNENFORCEABILITY OF GUARANTEE

          If anything (including any legal limitation,  disability,  liquidation
          or other  incapacity on the part of the Purchaser or any disclaimer by
          a liquidator or trustee in bankruptcy)  causes any Payment  Obligation
          and/or the guarantee set out in Clause 2.1 (Guarantee) to be or become
          invalid  or  unenforceable,  then,  subject  to Clause  2.5  (Right to
          defences),  the Guarantor  shall  perform and  discharge  such Payment
          Obligation as if it was the primary obligation of the Guarantor.

2.5       RIGHT TO DEFENCES

          The Guarantor  shall be entitled to raise as a defence to any payments
          due from it under  this  Clause  2, any  defences  which are or may be
          raised by the Purchaser against the Seller under the Sale Agreement or
          in  respect  of any other  matter or thing  and shall be  entitled  to
          deduct or  withhold  in respect of any such claim  (whether  by way of
          set-off,  counterclaim  or  otherwise)  any amount  which is or may be
          claimed  from time to time by the  Purchaser  against the Seller under
          the Sale Agreement or in respect of any other matter or thing.

2.6       NO EXERCISE OF SET OFF-RIGHTS

          The Guarantor  shall not exercise any rights which it may have against
          the  Purchaser  arising  from or otherwise  relating to its  guarantee
          under  Clause  2.1  (Guarantee)  or its other  obligations  under this
          Clause 2 unless  and  until  each  Payment  Obligation  and all of the
          obligations  of the Guarantor  under this Deed have been performed and
          discharged.

2.7       ENFORCEMENT

          The  Seller  may claim  under  the  guarantee  set out in  Clause  2.1
          (Guarantee) without first making demand of the Purchaser or taking any
          action to claim  under or enforce any other  right,  security or other
          guarantee  which  it may  hold  from  time to time in  respect  of any
          Payment Obligation.

2.8       UNCONDITIONAL AND IRREVOCABLE GUARANTEE

          The  Guarantor's  obligations  under  this  Clause  2,  including  its
          guarantee  under  Clause  2.1  (Guarantee)   are   unconditional   and
          irrevocable.

3.        GUARANTOR'S WARRANTIES

          The Guarantor warrants to the Seller that:


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          (a)  the  Guarantor has full power to enter into and perform this Deed
               this Deed will on execution by the Guarantor constitute valid and
               binding  obligations  on the  Guarantor  in  accordance  with its
               terms; and

          (b)  the  execution  and  delivery  of,  and  the  performance  by the
               Guarantor of its obligations under this Deed will not:

               (i)  result in a breach of any  provision  of its  memorandum  or
                    articles of association;

               (ii) result in a breach of any order,  judgment  or decree of any
                    court or government agency to which the Guarantor is a party
                    or by which the Guarantor is bound; or

               (iii)require the  Guarantor  to obtain any consent or approval of
                    its shareholders or any other material third party consent.

4.        GENERAL

4.1       COUNTERPARTS

          This Deed may be  executed in any number of  counterparts,  and by the
          parties on separate  counterparts,  but shall not be  effective  until
          each of the  parties  has  executed  at least  one  counterpart.  Each
          counterpart  shall  constitute  an  original  of this Deed but all the
          counterparts  together shall together  constitute but one and the same
          instrument.

4.2       NO RIGHTS OF THIRD PARTIES

          A  person  who is not  party  to this  Deed  has no  right  under  the
          Contracts  (Rights of Third  Parties)  Act 1999 to enforce any term of
          this Deed.

4.3       NOTICES

          Subject   to  Clause  4.4  (Agent   for   service  of   process)   all
          communications relating to this Deed shall be in writing and delivered
          by hand or sent by post or  facsimile  to the party  concerned  at the
          relevant  address  shown  at the  start of this  Deed  (or such  other
          address as may be notified from time to time in  accordance  with this
          clause by the relevant  party to the other party).  Any  communication
          shall take  effect if  delivered,  upon  delivery;  if posted,  at the
          earlier of delivery and, if sent by first class registered post, 10.00
          a.m.  on  the  second  Business  Day  after  posting  and if  sent  by
          facsimile,  when a complete  and  legible  copy of the  communication,
          whether  that  sent  by  facsimile  or a hard  copy  sent  by  post or
          delivered by hand, has been received at the appropriate address.

4.4       AGENT FOR SERVICE OF PROCESS

          The  Guarantor  irrevocably  agrees that any Service  Document  may be
          sufficiently   and  effectively   served  on  it  in  connection  with
          Proceedings in England by service on Aeroflex Test  Solutions  Limited
          (the "GUARANTOR'S AGENT") at Longacres House, Six Hills Way, Stevenage
          SG1 2AN in accordance with the provisions of Clause 4.3 (Notices) with
          a copy to Aeroflex Incorporated, P.O. Box 6022, 35 South Service Road,
          Plainview, New York 11803 Attention:  Michael Gorin, Vice Chairman. In
          the


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          event of the Guarantor's  Agent (or any replacement  agent) ceasing so
          to act or  ceasing  to have  an  address  in  England,  the  Guarantor
          undertakes to promptly  appoint  another  person as its agent for that
          purpose and to procure that notice of that appointment is given to the
          Seller in accordance with the provisions of Clause 4.3 (Notices).

4.5       GOVERNING LAW AND JURISDICTION

          This Deed  shall be  governed  by and  construed  in  accordance  with
          English  law.  Each party  irrevocably  submits  to the  non-exclusive
          jurisdiction  of the English  courts to settle any  dispute  which may
          arise under or in connection with this Deed.

EXECUTION:

The parties have shown their  acceptance  of the terms of this Deed by executing
it below:



SIGNED by Charles Badlato, Vice President    )  /s/Charles Badlato
AEROFLEX INCORPORATED                        )


SIGNED by James Mclaurin        , Director,  )  /s/James Mclaurin
and Christopher Edwards Director/Secretary,  )  /s/Christopher Edwards
duly authorised for and on behalf of         )
UBINETICS HOLDINGS LIMITED                   )


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