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 percent . To assure accuracy an individually serial-numbered traceable certificate is provided from Control Company ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of standards and technology). nineteen millimeter digits are readable from 6 meters. Alarm sounds for 30 seconds. Supplied with 2-year battery, magnet, stand/clip, and traceable certificate. Replacement battery cat. Number 350-19942.