This Traceable® digital stopwatch features precise, Traceable® timing for enzyme tests, viscosity measurements, animal studies, and all timed lab tests. Made for scientists in industrial, educational, hospital, and governmental labs who insist on the finest instrumentation. Engineered for ease of operation, accuracy, and reliability. Traceable to NIST for accuracy: 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 Technology). Quartz-crystal design is accurate to 0.0005%-over 100 times more accurate than other stopwatches. Ten-hour timing, with functions including single-action, time-out, interval-split, cumulative split, xontinuous roll-over timing, and countdown alarm timing. Vivid, 1/2-inch high LCD digits are ideal for viewing in lab and field. Tough, water-resistant ABS plastic case features tongue and groove craftsmanship and o-ring construction to seal out moisture, dust, and fumes encountered in harsh lab, plant, or field environments. Supplied with individually serial-numbered Traceable® Certificate. Replacement battery Cat. No. 1039. Size: 2-1/2 x 3 x 3/4-inch. Timing Range: 10 Hours. Accuracy: 0.0005%. Lanyard: 48-Inch. Weight: 2-1/2oz. Control Company#: 1030.