365510-NIST / Extech Digital LCD Stopwatch/Clock plus Calendar & Alarm with NIST Calibration The Extech 365510-NIST is a digital stopwatch and clock. This sporty, yellow stopwatch has a water-resistant housing, ...
365515-NIST / Extech Stopwatch/Clock & Backlit Display Digital LCD Stopwatch with NIST Calibration The Extech 365515-NIST is a digital stopwatch and clock. This stopwatch features a 12 or 24 hour clock format and ...