This is an easy-to-use instrument to measure the rotational speed. It Features non-contact design, automatic measurement and digital LED display, it can be widely used in electric motors, fans, washing machines, automobiles and more manufacturing industries. Pocket size and light weight for easy portability. Features: Portable handheld tachometer with 2.5-99999rpm testing range, 50-500mm effective testing distance. Non-contact design, automatic range, quick measurement, high precision. With memory function for convenient use. Digital LED screen for easy reading, clear at a glance. Powered by 9V 6F22 battery (not included). Compact and lightweight, easy to carry with the cloth bag, convenient to use anytime anywhere. Widely used in electric motors, fans, paper making, plastics, chemical fiber, washing machines, automobiles, airplanes, ships and other manufacturing industries. Note: 1. For more details, please read the user manual. 2. Size and color may be slightly different because of manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black Material: ABS Test Range: 2.5-99999rpm Accuracy: +/-(0.05%+1 digit) Collecting Time: 0.8s (60rpm) Effective Distance: 50-500mm Power Supply: 9V 6F22 Battery (NOT included) Tachometer Size: 130 * 67 * 27mm / 5.12 * 2.64 * 1.06in Storage Bag Size: 136 * 98 * 40mm / 5.35 * 3.86 * 1.57in Package Size: 15 * 9.5 * 5cm / 5.91 * 3.74 * 1.97in Package Weight: 145g / 5.11oz Package List: 1 * Digital Tachometer 3 * Reflective Tape Strip 1 * Storage Bag 1 * User Manual (English)