Features Easy Measurement: Supports both laser photo and contact measurement, the digital tachometer also has 6 digit display for simpler measurement. High in Accuracy: With 50‑500mm effective measurement distance and 0.8 seconds sampling time, the laser tachometer can store the tested value. The Working Tips: Press the TEST button to activate the laser perpendicular to the measured object, and keep the distance between in 500mm. Wide Application: Widely used on motors, fans, papermaking, plastics, chemical fibers, washing machines, automobiles, airplanes, ships, etc. Simpler Carrying: Comes with a compact size and a light weight as well, the tachometer gauge is very convenient to carry for outdoor working. Specification: Item Type: Digital Tachometer Model: TA500C Material: ABS Speed Display: 6 digit display, 99999 maximum. Effective Measurement Distance: Approx. 50 ~ 500mm / 1.97 ~ 19.69in Sampling Time: 0.8 seconds for above 60RPM. Automatic Shutdown: 15 minutes, can be manually turned off. Operating Environment: -10~50℃, maximum 80% relative humidity, indoor altitude <2000m. Storage Environment: -10~50℃, maximum 70% relative humidity without battery. Battery: 2 x 1.5V AAA battery, without battery.  Package List:1 x Digital Tachometer2 x Reflective Paper4 x Tachometer Head1 x User Manual Package List 1 x Digital Tachometer 2 x Reflective Paper 4 x Tachometer Head 1 x User Manual