1[Non Contact Photo Tachometer] This digital tachometer utilizes non contact photo technology, high speed aiming operation, ensuring accurate speed measurement. 2[Large LCD Display] With a large, easy to read LCD screen and 5 digit display, this digital RPM meter allows for convenient reading of RPM values within the range of 2.5 to 99999rpm. 3[Data Storage] This rotation speed meter is able to store upper limit, minimum, and maximum readings, and features an automatic zero adjustment function for seamless operation. 4[Ergonomic Design] The housing of this RPM meter is meticulously crafted for comfortable hand placement, ideal for measuring the rotational speed of motors and machine parts. 5[Wide Application] Widely used in a variety of manufacturing industries such as motors, fans, paper making, plastics, textiles, washing machines, automobiles, airplanes, and ships. 1 x Digital Tachometer 3 x Reflective Strips 1 x User Manual