Timer counts down from 99 minutes, 59 seconds in second increments with 3-key ease and big-digit visibility. Automatic memory resets the display to the last programmed time#ideal for repetitive tests. Quartz-crystal timing accuracy is 0.01%. To assure accuracy an individually serial-numbered Traceable® Certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and T echnology). Nineteen millimetre digits are readable from 6 m. Alarm sounds for 30 seconds. Size is 2-1/2 x 2-1/2 x 1/2 inches. Weight is 2 ounces. Supplied with 2-year battery, magnet, stand/clip, and Traceable® Certificate. Replacement battery Cat. No. 1105.