Exhibit 99.1

Tech Laboratories, Inc. Announces Event of Default under its 6.5% Convertible
Promissory Notes

NORTH HALEDON, N.J. -- Aug. 2 /PRNewswire-FirstCall/ -- Tech Laboratories, Inc.
(OTC Bulletin Board: TCHL), announced that an Event of Default occurred today
under its outstanding 6.5% promissory notes. As of July 31, 2002, the
outstanding principal and interest under the notes is $1,221,611. The Event of
Default occurred due to the fact that the waiver the company had been granted by
the noteholders waiving any event of default under the notes, including the
requirement to have declared effective on or before June 29, 2002, the
registration statement covering the shares underlying the notes had expired
without the company and the noteholders having reached a new agreement.

The company's president, Bernard M. Ciongoli, stated "We were unable to reach an
agreement with the noteholders, but we intend to continue to seek a resolution
of this matter, which we believe would be in everyone's best interests." Tech
Laboratories, Inc. is the owner of the DynaTraX(TM) Digital Matrix Switch
Technology, which is a protocol independent digital network management tool. It
resides between the equipment side and distribution side of a network and allows
for the simple management of entire network structures and multiple remote
networks, all from a single desktop workstation.

Tech Laboratories, Inc., through its subsidiary, Tech Logistics, Inc., also
manufactures and sells an infrared perimeter intrusion detection system for
security and anti-terrorist activities.

Certain statements in this press release with respect to future expectations and
plans may be regarded as "forward-looking statements" within the meaning of
Section 27A of Securities Act of 1933, Section 21E of Securities Exchange Act of
1934, and as that term is defined in the Private Securities Litigation Reform
Act of 1995. Such statements, including, but not limited to, statements with
respect to future earnings, and all other forward-looking statements involve
risks and uncertainties and are subject to change at any time.