The perfect size‚Äîhas a large-screen LCD and a small, lab-bench footprint. Times up from 0.01 second to 9 hours, 59 minutes, 59 seconds, and 99 hundredths of a second. Switchable between cumulative and interval-split, the unit also allows an infinite number of time-outs. Oversize buttons make it easy to use. Three 4mm sockets (and supplied test leads) allow external triggering of the START/STOP and SPLIT/LAP/RESET functions of the timer. Digital display is 3/4-inch-high and is readable from 10 feet. Unit features precise, quartz-crystal Traceable® timing for enzyme tests, viscosity measurements, animal studies, and all timed lab tests. Accurate to 0.001% with resolution to 0.01 second. Engineered for ease of operation, accuracy, and reliability. 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). Fulfills ISO 9000 needs, lab certification requirements, and governmental demands. Portable design permits the unit to be moved easily. Attractive, high-impact ABS plastic case is designed for hard laboratory use. Supplied with a AA battery (2-year continuous). Size is 4 x 4-1/4 x 1- 3/4 inches. Weight is 7 ounces. Replacement battery Cat. No. CON1111.