Precise and reliable 10-hour timing. Certified Traceable to NIST. Large Display and quartz-crystal accuracy and water-resistant. Precise, Traceable timing for enzyme test, 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.  Quartz-crystal design is accurate to 0.0003%.  Over 100 times more accurate than other stopwatches.  Functions include single-action, time-out, interval-split, cumulative split, and continuous, roll-over timing.  Resolution is 0.01 second.  Times 9 hours, 59 minutes, and 99 seconds, and 99 hundredths.  Tough, water-resistant ABS plastic case features tongue-in-groove craftsmanship, and O-ring construction to seal out moisture, dust, and fumes encountered in harsh lab, plant or field environments.  Vivid, 0.4-inch high LCD digits are ideal for lab use.  Size: 2-1/2" x 3" x 3/4” and weight is 2-1/2 ounces.  Lanyard is 40 ". Supplied with battery and individually serial-numbered NIST Traceable Certificate.