This Digital Tachometer is used to detect rotate speed, linear velocity or frequency of motor. It can be widely used in motor, fan, washing machine, automobile, airplane and other industries. Features: Uses the laser for precise measurement. Wide measuring distance from 50 to 200mm. LCD display with backlight for clear indication. Includes RPM and Count measurement. Max. / Min. value measurement. Includes low battery indication, data storage and auto power off function. Specifications: Color: Red + Black Material: ABS Display: LCD Backlight Display Measuring Distance: 50 ~ 200mm *Measuring Range: RPM: 10 ~ 9999.9r/min, 10000 ~ 99999r/min COUNT: 0 ~ 99999 *Resolution: RPM: 0.1r/min, 1r/min COUNT: 1 digit Accuracy: ±(0.04%+2) Power Supply: 3 * 1.5V AAA Battery(NOT Included) Operation Environment: 0~50°C / 32~122°F Storage Environment: -20~60°C / -4~140°F Item Size: Approx. 11.9 * 5.1 * 2.8cm / 4.7 * 2 * 1.1in Item Weight: Approx. 83g / 2.9oz Package Size: Approx. 17.8 * 6.4 * 4cm / 7 * 2.5 * 1.6in Package Weight: Approx. 117g / 4.1oz Packing List: 1 * Digital Tachometer 1 * User Manual(English)