Stopwatch and Countdown Timer – 100 Hour. The unique feature of this timer is that it also has a true stopwatch mode with 1/100 second resolution, lap and split with a range of 100 hours. In the Timer mode it counts down from 100 hours in 1 second intervals. The display indicates time elapsed after the alarm and a memory recalls last timer setting for reuse. Has built-in stand, pocket clip, and magnet. Button cell battery included. N.I.S.T. traceable certificate of compliance available. Dimensions: 2⅝ x 2¾ x ⅜” Weight: 1.7 oz.