Just picked me up one of the ZipZaps Speed and Lap Counters yesterday (
http://www.radioshack.com/search.asp?find=60-7530 ). Pretty spiffy little accessory and seems to be quite accurate, the way that they positioned the IR sensors causes the counter to measure when the car passes the first and then the second sensor, thereby measuring accurate FPM.
One gripe that I have 'tho, is that any strong light will cause it to malfunction, or not to detect the IR LEDs at all. I took it outside yesterday, a VERY cloudy dark day, and I couldn't even get the sensors to pick up the IR LEDs at all. Looks like this is gonna be strictly an indoor accessory (<aarrggh>, as most of my Zap racing is out in my driveway).
Anyhow, quite a cool little device, much better than any of the home-rigs that I've either thought up or read about on the Internet. For US$10 bucks, you can't go wrong.
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