Extech’s 365535 waterproof decimal stopwatch/clock has user-selectable resolutions of 1/100 of a second, 1/1,000 of a minute and 1/100,000 of an hour; a large triple display with adjustable contrast; and 500 memory records. The calendar displays day, month, date and time of day (12 or 24 hour format). It has a daily alarm, and the countdown timer has three modes: countdown stop, countdown repeat, and count down then count up.