The Triplett TA150-NIST Tachometer provides fast and accurate non-contact RPM of rotating objects and count (REV) measurements. The laser pointer beam provides accurate long distance measurements for photo tachometer measurements with a 19.7” (500mm) maximum target distance. It features a quartz crystal timebase, fast 0.5 second sampling rate (over 120RPM) and a 5-digit backlit LCD display. Built-in memory recalls Min/Max/Last Value stored. Includes Certificate of Traceability to N.I.S.T., 23” (58.4cm) reflective tape, 9V battery and carrying case. 1-year warranty.