The Traceable® big digit timer/stopwatch has four channels, each of which may be used simultaneously as countup stopwatches or in any combination of countup/countdown. You can program it to count down from 99 hours, 59 minutes, 59 seconds in 1 second increments. Unit also displays time-of-day and has a memory. Extra-loud alarm sounds for 1 minute or can be silenced manually. Includes magnetic back, flip-open easel for standing on the lab bench, spring fastener for clipping to a notebook and a hole for use with a lanyard. Fits in the palm of your hand and has a 3/4 in.-high readable display from across the lab. An ISO/IEC 17025 individually-serial-numbered Traceable® certificate is supplied to indicate instrument traceability to standards provided by N.I.S.T. Comes with two-year silver oxide battery. Dimensions (W x D x H): 2.87 x 0.93 x 2.6 in. Wt. 2 oz.