If you get the Ducati I/R one, you also need the I/R transmitter/beacon to be set up on the pit wall (see:
http://www.xtracing.com/en/accessories/index.php). When I got back into racing about 6 years ago, I first bought one of these I/R lap timers. I used it twice (once it worked most laps, and once it didn't work at all, despite changing batteries and locations over and over). Then I sold it a month later and bought a GPS timer and never looked back!
Bear in mind this was also when you were
allowed to lap time at track days! Oran Park etc. Nowadays they confiscate the beacon immediately and send you home.
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