This Contact 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: Adopts the MCU and electrooptical technology for contact measurement efficiently. Wide measuring range and high resolution. LCD display for clear indication. Max./Min./LAST value measurement. Equipped with the linear channel rate sensor, easy to measure the linear rate of wire, cable, etc. Convertible accessories for different measurement. Includes low battery indication and auto power off function. Comes with a protective bag for easy storage. Specifications: Name: SMART SENSOR Color: Black + Yellow Material: ABS Display: LCD Backlight Display *Measuring Range: 0.5 ~ 19999RPM 0.05 ~ 1999.9m/min 0.2 ~ 6560ft/min *Resolution: 0.1RPM (0.5 ~ 999.9 RPM) / 1RPM(above 1000RPM) 0.01m/min (0.05 ~ 99.9m/min) / 0.1m/min(above 100m/min) 0.1ft/min (0.1 ~ 999.9ft/min) / 1ft/min(above 1000ft/min) Accuracy: ±(0.05%+1dgt) Sampling Time: 0.8s(over 60RPM) Power Consumption: Approx. 30mA Power Supply: 3 * 1.5V AAA Battery(NOT Included) Operation Environment: 0~50°C / 32~122°F Storage Environment: -10~60°C / -14~140°F Item Size: Approx. 17 * 5.6 * 3.5cm / 6.7 * 2.2 * 1.4in Item Weight: Approx. 125g / 4.4oz Package Size: Approx. 20.5 * 11.1 * 6cm / 8.1 * 4.4 * 2.4in Package Weight: Approx. 230g / 8.1oz Package List: 1 * Digital Tachometer 5 * Rubber Tips 1 * Protective Bag 1 * User Manual(English)