Ideal QC (quality control) countdown and alarm timer combines easy, 3-button operation with giant-size digits. Quartz-crystal accuracy to 0.01%. Individually serial-numbered Traceable® Certificate indicates timer's traceability to NIST standards. Times may be set up to 20 hours in any minute increment. At zero, a 1-minute alarm sounds. 3/4"-high digits are readable from 20 ft. Size is 3-1/2 x 2 x 1/2". Weight is 2 oz. Supplied with 3-year AAA battery and magnet/clip on back.