Atp 12mm digit stopwatch tm 308 atp tm 308 p the atp tm 308 12mm digit stopwatch is housed in an impact resistant abs case this stopwatch is easy to use for timing single events this economy stopwatch with up to 1 100th of a second resolution features stop start lap and split time mode and reset buttons the atp tm 308 stopwatch is able to display 12 and 24 hour clock time calendar display and alarm p atp 12mm digit digital stopwatch tm 308