This non-contact tachometer is a professional and practical motor speed meter to measure the revolutions per minute(RPM) with wide measuring range and high resolution. It's featured with high accuracy measurement, quick measuring time and long detecting distance up to 500mm(20 inch).This tachometer is very easy to use by applying a reflective tape(included 3 in package) on target object, then aim at the mark by beam. This tachometer has wide range of applications, such as measuring rotating speed of machine, motors, wheels, lathe for metal or wood cutting work, electrical fan, paper making, plastic industry, chemical fiber, washing machines, car making etc.No-Contact handheld digital photo tachometer with stable performance.Automatically record the MAX. value, Min. value and Last value with low battery indication.Capable of measuring at a distance from 2-20in(50-500mm) with large LCD display.0.8 Second sampling time and 5-digit 18mm 0.7 inch LCD display with non-contact RPM measurement.Measuring Range: 2.5RPM - 99,999RPMResolution: 0.1RPM at 2.5-999.9RPM, 1RPM at 1000-99,999RPMAccuracy: (0.05%+1 digit)Time Base: 6MHz Crystal OscillatorTest Range Select: Automatic SwitchingFunction: Display Last Value, MAX. Value, Min. ValuePower Supply: 1 x 9V 6F22 Battery(NOT Included)Power Consumption: Approx. 30mAWorking Temperature: 0-50(32-122)Material:plasticcolour:BlackPackage Contents:1 x Digital Tachometer3 x Adhesive tape1 x Carrying BagOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.