Feature:1. Easy Measurement: Supports both laser photo and contact measurement, the digital tachometer also has 6 digit display for simpler measurement.2. High in Accuracy: With 50500mm effective measurement distance and 0.8 seconds sampling time, the laser tachometer can store the tested value.3. The Working Tips: Press the TEST button to activate the laser perpendicular to the measured object, and keep the distance between in 500mm.4. Wide Application: Widely used on motors, fans, papermaking, plastics, chemical fibers, washing machines, automobiles, airplanes, ships, etc.5. 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 TachometerModel: TA500CMaterial: ABSSpeed Display: 6 digit display, 99999 maximum. Effective Measurement Distance: Approx. 50 - 500mm or 1.97 - 19.69inSampling Time: 0.8 seconds for above 60RPM. Automatic Shutdown: 15 minutes, can be manually turned off. Operating Environment: -10-50, maximum 80 percent relative humidity, indoor altitude andlt 2000m. Storage Environment: -10-50, maximum 70 percent 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