Originally Posted by gsxr

Some are better than others, and the newer ones are pretty decent. I have the RaceTech AP-22 but I don't know where to buy it, since cb-racing.com apparently dropped it. (?) Avoid the old, original G-Tech Pro unit... too limited and too open to erroneous results if the in-car setup was less than perfect. I'd look for an AP-22 if you can find one... it's VERY configurable. And once dialed in, the data reported was within 1% accuracy at the dragstrip, compared to the official timing lights. Hard to beat that for a dash-top box!