For those pilot's who prefer the exactness of a digital timer, we can offer this professional digital stopwatch. In addition to being water resistant and having an accuarate 1/100th second stopwatch with lap facility, it comes with the added benefits of a functioning 12-24hr watch and alarm with day and date display, european and USA calendars, hourly chime if required and a 12mm bold digit height. Measures 73x63mm with neck cord, and takes a 392/LR41 watch battery which is included.