G-Tech meter

[dzorde]

Has anyone heard of an aftermarket measurement device called a G-tech meter
(at least that's what I think its called).  It's a small unit that sticks to
your windscreen with a suction cup and plugs into the cigarette lighter
socket for power.  It will give you g-forces, 1/4 mile time, HP rating and a
few other things I think.  Someone in our car club bought one to try out and
he said it was quite accurate, the HP reading was 2HP less than actual
measurements from dyno testing.  His 1/4 mile times were also close to
actual times.

Has anyone used this device ?  I would like the feedback from a few more
people before I'd consider buying one, although its reasonably cheap at
AU$250 after freight and taxes.  I need something to help with setting up
the suspension in the race car, and this device may just be it.

How does it measure the distance (doppler effect ?), or does it calculate
distance from your acceleration ?  If this is the case how does it go in
hilly areas, bumpy roads, etc ?

Thanks in advance

Dan     dzorde at geocities.com