This non-contact tachometer is a professional and practical motor speed meter to measure the revolutions per minute(RPM) with wide measuring rangeand high resolution. It's featured with high accuracy measurement, quick measuring time and long detecting distance up to 500mm(20 inch) with laser.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 laser beam. Thistachometer 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. Features: No-Contact handheld digital photo tachometer with stable performance. Wide measuring range(2.5RPM to 99999 RPM) & high resolution(0.1RPM or 1RPM). 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 LCD display with non-contact RPM measurement. Wide usage: usually can be used in the field of motor, wheels, lathe for metal or wood cutting work, electrical fan, paper making, plastic industry,chemical fiber, washing machines, car making etc. Specifications: Color: Dark Grey Material: ABS PLastic Display: 5-digit 18mm(0.7") LCD Display Measuring Range: 2.5RPM - 99,999RPM Resolution: 0.1RPM at 2.5-999.9RPM, 1RPM at 1000-99,999RPM Accuracy: ±(0.05%+1 digit) Measuring Distance: 50-500mm / 2-20in Time Base: 6MHz Crystal Oscillator Test Range Select: Automatic Switching Sampling Time: 0.8s(over 60RPM) Function: Display Last Value, MAX. Value, Min. Value Power Supply: 1 * 9V 6F22 Battery(NOT Included) Power Consumption: Approx. 30mA Working Temperature: 0-50(32-122) Product Size: 130 * 70 * 29mm / 5.12 * 2.76 * 1.14in Product Weight: 79g / 2.80oz Package Size: 15 * 9.3 * 5cm / 5.91 * 3.66 * 1.97in Package Weight: 113g / 4.00oz Note: 1. You must stick the reflective tape onto the target object before measuring. 2. Do not point the laser beam towards eyes directly; safety eyewear is recommended. 3. Do not use it near explosive gases or in other potentially explosive areas. Package List: 1 * Digital Tachometer 3 * Reflective Tape Marks 1 * User Manual(English)