The Triplett TA150 Tachometer provides fast and accurate non-contact measurements of rotating objects (RPM) and count (REV). 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 120 RPM) and a 5-digit backlit LCD display. Built-in memory recalls Min/Max/Last Value stored. Includes 23" (58.4cm) reflective tape, 9V battery, and carrying case.