If you are handy with a soldering iron then there are several for which the hardware can be made cheaply. Trackmate has a DOS version for $39-$49 that is accurate. Gregory Braun has one called Laptimer 2000 that is for Windows but is not as accurate as Trackmate. Another Free and accurate one is SRM2 but it too is DOS.
http://infoserve.net/oss/slotcar/catalog.htm (includes hardware)
http://www.gregorybraun.com/LapTimer.html (free but you make the hardware)
http://www.cenobyte.nl/slotracemanager/hoofdframe.html (free but you make the hardware)
http://infoserve.net/oss/slotcar/catalog.htm (includes hardware)
http://www.gregorybraun.com/LapTimer.html (free but you make the hardware)
http://www.cenobyte.nl/slotracemanager/hoofdframe.html (free but you make the hardware)
