Traceable® jumbo-digit timers offer precise timing with resolution of 1 second and accuracy of 0.01%. These portable countdown alarm timers can be set for 1 second to 24 hours. Allows simultaneous programming of two different activities. Each channel has a distinct electronic alarm and display indicator that activates when the timer reaches zero. The alarm can be turned off, or it is automatically silenced after 1 minute. There is also a time-of-day and stopwatch dual display. Or you can use the memory function to recall last countdown times for repetitive tests. The digits are 1 in.-high and readable from 20 ft. The timers may be used flat, in the sit-up position or may be wall-mounted with a supplied bracket. AAA battery included. An ISO/IEC 17025 individually-serial-numbered Traceable® certificate is supplied to indicate instrument traceability to standards provided by N.I.S.T. Dimensions (W x H x D): 3¾ x 5½ x ½ in. Wt. 5 oz.