This tachometer is a high quality instrument to measure the revolutions per minute(RPM) with wide measuring range and high resolution. It is 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 in package) on target object, then aim at the mark by Laser beam. This tachometer has wide range of applications, such as measuring rotating speed of machine, motors, wheels, lathe for metal or wood cutting work, etc. Features: No- handheld digital tachometer with stable performance. Automatic and manual measurement modes for selection. Wide measuring range(2.5 to 99999 RPM) and high resolution. MAX./MIN./AVG. values record function. Data hold function, data record and recall(60 readings). LCD screen with white backlight, easy to read. Capable of measuring at a distance from 2-20in(50-500mm). Auto and manual power off. Low battery indication. Specifications: Color: Blue / Red(Optional) Material: ABS PLastic Measuring Range: 2.5-99999 RPM Resolution: 0.1RPM at 2.5~999.9RPM; 1RPM at 1000~99,999RPM Accuracy: +/-0.02percent +1 digit Measuring Distance: 50~500mm / 2~20in Sampling Time: 0.5s(above 120RPM) Data Storage Capacity: 60 Readings Auto Power Off: After 20s Operation Temperature: 0 to 50 celsius (32 to 122 Fahrenheit ) Operation Humidity: 10 to 90percent RH Storage Temperature: -10 to 60 celsius (14 to 140 Fahrenheit ) Storage Humidity: 10 to 75percent RH Power Supply: 1 * 9V 6F22 Battery(NOT Included) Product Size: 145 * 90 * 35mm / 5.7 * 3.54 * 1.4in Product Weight: 79g / 2.81oz Package Size: 20 * 14 * 4cm / 7.87 * 5.5 * 1.57in Package Weight: 134g / 4.73oz 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 1 * Reflective Tape 1 * User Manual(English)