Description: 【Versatile】: This tachometer is suitable for various detection switch signal, including Hall switches, metal switches, and infrared switches, offering flexibility for different applications 【Alarm Output】: Equipped with an NPN alarm signal output, this device allows users to connect indicators or buzzers for warning purposes. Users can set adjust alarm thresholds to suit their specific needs 【High Sensitivity and Reliability】: The included 3 wire sensor utilizes advanced electronic technology to ensure high sensitivity, strong reliability and stable long term. It is ideal for both speed measurement and counting functions 【Speed Measurement】: Utilizing a Hall sensor and multi cycle average speed measurement method, this device provides a wide range of low speed to high speed measurements 【Performance Specifications】: The tachometer offers a basic range of 30 to 80000 RPM per single detection point It features a refresh rate of over once per second and displays results on a clear 4 digit 0.56 inch red digital tube display in a compact PP casing measuring 7.8cmx4.2cmx2.4cm Specification: Material: PP Size Chart: 7.8cmx4.2cmx2.4cm/3.07inchx1.65inchx0.94inch Package Includes: 1 Tachometer Kit Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.