Exhibit 10.41

Datametrics Corporation
1717 Diplomacy Row
Orlando, Florida 32809

December 18, 2007

JAG Multi Investments, LLC
150 East 52nd Street
29th Floor
New York, NY 10022

The Philip S. Sassower 1996 Charitable Remainder Annuity Trust
110 East 59th Street
Suite 1901
New York, NY 10022

Philip S. Sassower
110 East 59th Street
Suite 1901
New York, NY 10022

Re: Datametrics Corporation

To Whom It May Concern:

This letter memorializes the agreement by and among Datametrics Corporation, a
Delaware corporation (“Datametrics”), Philip S. Sassower (“Sassower”) and JAG
Multi Investments, LLC, a Delaware limited liability company (“JAG”, together
with Sassower, the “Issuers”), regarding the letters of credit, dated December
18, 2007, issued by each of Philip S. Sassower and JAG to Comerica Bank
(“Comerica”) on behalf of Datametrics (the “Letters”).

In the event that Datametrics should default under the Master Revolving Note
issued by Datametrics to Comerica , dated December 18, 2007 (the “Master Note”),
and Comerica Bank enforces any of its rights by drawing funds against the
Letters, then the Secured Promissory Note issued by Datametrics to The Philip S.
Sassower 1996 Charitable Remainder Annuity Trust and JAG, as yet undated (the
“Note”), will be in full force and effect to the extent of any amounts drawn
against the Letters by Comerica. In the event that Datametrics does not default
under the Master Note, the Note shall have no force and effect.
 
 
 

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In connection with the performance of the Issuers in providing the Letters to
Comerica Bank, Datametrics hereby agrees to compensate the Issuers in the amount
of $25,000 (the “Fee”). The Fee shall be paid by increasing the principal amount
due under the Secured Promissory Note issued by Datametrics to SG DMTI Capital,
LLC, a Delaware limited liability company, dated December 30, 2005 (the
“Original Note”), pursuant to the Seventh Allonge to the Original Note, dated
December 18, 2007.
 

       
Very Truly Yours,
     
Datametrics Corporation
 
   
   
  By:   /s/ John Marceca   

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John Marceca, President 

 
Agreed and Accepted:
              JAG Multi Investments LLC              

By: /s/ Alexander M. Goren
   

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Name: Alexander M. Goren
Title: Manager

   

       
The Philip S. Sassower 1996 Charitable Remainder Annuity Trust
             

By: /s/ Philip S. Sassower
   

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Name: Philip S. Sassower
Title: Trustee
   

 

       
Philip S. Sassower
             

Philip S. Sassower
   

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