Over the years, Glenn Whidden developed a number of products that were
useful for finding eavesdropping equipment
(bugs), starting with a number
of add-ons for the Scanlock range
of bug-tracers. One of his first products was the so-called
a fully automatic bug scanner that was connected to the
Scanlock Mark VB.
COMPUSCAN eventually evolved into Glenn's 'Eagle'.
Other add-ons for the Scanlock Mark VB were the
Spectrum Monitors SM-1 and SM-2.
In the UK, some TSA products were sold by
the developers of the
Scanlock bug tracers.