Timer provides precise timing for enzyme tests, viscosity measurements, animal studies, and all timed laboratory tests. Precision timing Easy-to-use oversized buttons Times up from 0.01 seconds to 9 hours, 59 minutes, 59 seconds, and 99 hundredths of a second Three 4mm sockets (and supplied test leads) allow external triggering of the start/stop and start/lap/reset functions of the timer. Digital display is 1.9 cm(3/4") high and is readable from ten feet. Timer encased in sturdy ABS construction. Quartz-crystal timing assures a resolution of 0.01 seconds and an accuracy of 0.001%. Unit switches between cumulative and interval split and allows an infinite number of timeouts. Certifications: A serial numbered certificate is provided from an ISO 17025 calibration laboratory accredited by A2LA to indicate instrument traceability to standards provided by the National Institute of Standards and Technology. Ordering information: Supplied with AA alkaline battery for two years of continuous use.