This lab-top timer counts down from 24 hours to 1 second, in second increments, with an accuracy of 0.01%. Its memory chip allows programming an “instant replay” repeat time, which appears on the display at the touch of a key. Memory time is locked in until changed. An LCD screen is designed for viewing at any angle. Timer also features a stopwatch mode and time-of-day clock. Timer is supplied with AA battery and includes a Traceable® certificate (issued by an A2LA-accredited, ISO/IEC 17025 certified lab), which documents traceability to N.I.S.T. standards. Dimensions (W x H x D): 3¼ x 3¼ x ¾ in. Wt. 4 oz.