October 3, 2000 Mr. William Estroff, President eMissions Testing, Inc. 104 Colony Park Drive Suite 600 Cumming, Georgia 30040 Re: $100,000 Principal Amount 7% Convertible Debenture of eMissions Testing, Inc. dated September 15, 2000 Dear Mr. Estroff:...

                                                                   EXHIBIT 10.19

                          GLOBAL CAPITAL ADVISORS, LTD.



                                 October 3, 2000




Xx. Xxxxxxx Xxxxxxx, President
eMissions Testing, Inc.
000 Xxxxxx Xxxx Xxxxx
Xxxxx 000
Xxxxxxx, Xxxxxxx 00000

     Re:  $100,000 Principal Amount 7% Convertible Debenture of eMissions
          Testing, Inc. dated September 15, 2000

Dear Xx. Xxxxxxx:

         This letter confirms that the purchase price for the Convertible
Debenture referenced above (the "Debenture") shall be 100% of the principal
amount of the Debenture rather than 95% of the principal amount of the Debenture
as set forth in that certain Securities Purchase Agreement between GCA Strategic
Investment Fund Limited and eMissions Testing, Inc. All other terms and
conditions of the Securities Purchase Agreement shall remain unchanged for the
closing related to the issuance of the Debenture.


                                    
                                       Sincerely,

                                       /s/ Xxxxx X. Xxxxxx
                                       -----------------------------------
                                       Xxxxx X. Xxxxxx
                                       Director
                                       GCA Strategic Investment Fund Limited




LNL/cbc