Timer counts down from 9999 minutes in minute increments and has a countdown resolution of 1 second for times under 99 minutes. With the flip of a switch, select either an audible alarm, or bright flashing LED visual alarm. Automatic memory resets the display to the last programmed time—ideal for repetitive tests. Thru-zero feature allows counting down, alarming, then counting up. To assure accuracy an individually serial- numbered Traceable® Certificate is provided from the manufacturer’s ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). Three-eighths-inch high digits are readable from 10 feet. Size is 3 x 2-1/4 x 3/4 inches. Weight is 3 ounces. Supplied with two AAA batteries, integrated magnet, stand, and clip.