This professional and practical tachometer with wide measuring type and range(0.519999RPM) is used to detect rotate speed, linear velocity or frequency of motor. It can be widely used in motor, electrical fan, paper making, plastic industry, chemical fiber, washing machines, car making, automobile, airplane and other industries.Features:Maximum value, minimum value, average value, last measured value data hold function.Adopt the MCU and electrooptical technology for contact measurement efficiently.Wide measuring range and high resolution with LCD backlight display for clear indication.Come with 4 convertible connecting heads for different speed measurement.Equipped with the linear channel rate sensor, easy to measure the linear rate of belt, wire, cable, etc.Large LCD screen display for clear reading with low battery indication and auto power off function.Specifications:Color: BlackMaterial: Plastic*Measuring Range: 0.5 19999RPM*Resolution: 0.1RPM (0.5 999.9 RPM) / 1RPM(above 19999RPM)Accuracy: (0.05%+1dgt)Sampling Time: 0.8s(60RPM or above)Function: MAX. Value, MIN. Value, Average Value, the Last Displayed Value, Low Battery Indication, Automatic Power offWide Usage: 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.Power Supply: 2 * 1.5V AAA Battery(NOT Included)Working Temperature: 050(32122)Product Size: 158 * 55 * 32mm / 6.2 * 2.2 * 1.3inProduct Weight: 116g / 4.1ozPackage Size: Approx. 18 * 12.5 * 5.3cm / 7.1 * 4.9 * 2.1inPackage Weight: Approx. 225g / 7.9ozPackage List:1 * Digital Tachometer1 * Rubber Tip for Linear Surface Speed3 * Rubber Tip for Rotating Speed1 * Rubber Tip Connector1 * User Manual(English)