[dscott]

I have one also. It works great. It's all based on an accelerometer in the unit so you need to make sure it's level while using it. I've had several people use it and then take thier car to the track. It's always been within 1 or 2 tenths of actual 1/4 times.
Don

BTW, my 1988 Chev extended long box runs consistent 18.8 1/4 miles, and 11 second 0-60. Anybody want to race!!