This compact unit is a timer, stopwatch, and clock. Timer can be programmed to count down from 23 hours, 59 minutes, 59 seconds with 1-second resolution. At zero, a 1-minute alarm sounds and "thru-zero" timing automatically begins counting up, displaying time elapsed. Memory recall automatically returns timer to last programmed setting. Accuracy is 0.01%. LCD display has 1/2"-high digits. Size is 3 x 2-1/2 x 1/2" and weighs 3 oz. In the count-up/stopwatch mode, unit times to 23 hours, 59 minutes, and 59 seconds. Clock functions show hours, minutes, and seconds to ensure a correct reading. Individually serial-numbered Traceable® Certificate indicates traceability to NIST standards. Comes complete with magnet, flip-out stand, and clip for total flexibility. Battery provides 2 years of "always on" timing. Replacement battery Cat.No. 291-1039.