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IR sensors are used and their timers time out to 0.0001 seconds. Reflective stickers must be placed on each lane, as the IR emitters and sensors are located in the bridge.  Compatible with GrandPrix Race Manager, via an Ethernet to Serial Adapter and with their own race management software via WiFi.

They offer several models of IR timing systems.  Timing is out to 0.0001 seconds.  Compatible with their own race management software and GrandPrix Race Manager, using the Custom Timer interface.

Micro Wizard offers 2 different models of their Fast Track timers.  IR emitters and sensors are used and their timers time out to 0.0001 seconds. Their Q model timers are available with single or double sided display.  Their K1 timers are available assembled or in kit form. The kit is if you want to save a bit of money and don't mind some simple basic assembly.  Compatible with GrandPrix Race Manager and some other race management software.

They also offer a combination light tree and solenoid start gate unit.

Their Twin Turbo timer use IR emitters and sensors, while their DerbyStick timers require you to provide a light source for the photo sensors (they do offer a light bridge). With the Twin Turbo, results are displayed with large numerals above each lane.  The DerbyStick has no results display at all, so you must use it with a computer.  Claims a precision of 0.0001 seconds.  With the DerbyStick timer, since the sensors are not mounted in an enclosure, you can use this timer for other types of races like Space Derby and Raingutter Regatta. Compatible with GrandPrix Race Manager and some other race management software.

Timers for 1 to 8 lane tracks.  Reports times out to 0.0001 seconds. They also carry a USB video capture device which snaps a photo finish picture at the instant the first car crosses the finish line. Compatible with GrandPrix Race Manager and some other race management software.

Uses a mechanical sensor flag that is hit by the car as it crosses the finish line. They claim this sensor can withstand millions of hits without damage. However, from the pictures on their site the sensors can get slightly bent, so all of the sensor flags may not line up well, meaning that the lanes with the flags bent less actually have a slight advantage. Finish results and times are announced audibly, though they also support a computer interface. Timer precision is claimed to be better than 0.0001 seconds.  Only their rather expensive software will work with their timer. Though, some people have successfully used this timer with GrandPrix Race Manager, using the Custom Timer interface.

Offers timers manufactured by eTekGadget especially for BestTrack. Timers for 1 to 8 lane tracks.  Reports times out to 0.0001 seconds. Compatible with GrandPrix Race Manager and some other race management software.

Manufacturers of The Judge and Transponder timers. An IR timing system that comes with a stopwatch or computer interface options that allow display of times out to 0.0001 seconds, though they make no claims as to precision on their site. They offer used or older models at reduced cost, or you can rent a unit. They also offer a version that works in sunlight. Compatible with GrandPrix Race Manager and some other race management software.

They also offer solenoid start gates to fit most tracks and a light tree.