Features: This product is a multifunctional speed measuring and counting device with speed measurement, counting, and upper limit alarm output functions. It is suitable for various mechanical equipment such as harvesters, fans, and other applications requiring speed monitoring. The device is compatible with Hall switches, metal proximity switches, infrared proximity switches, and other detection switch signals. It can output an NPN alarm signal, allowing users to connect an indicator lamp and sound generator for warnings. The alarm threshold can be customized by the user. The sensor is a three-wire type that uses electronic technology, providing high sensitivity, strong reliability, good anti-interference performance, and stable operation over long periods. It is suitable for both speed measurement and counting applications. Equipped with a Hall sensor for speed measurement, the device utilizes internal programming to enable one probe to detect multiple points, improving detection accuracy. Multi-period average velocimetry ensures a wide measurement range for both low and high speeds, along with excellent accuracy. The counting function is achieved through the external counting feature of the microcontroller’s timer, ensuring stable and reliable operation. Specifications: Material: ABS Working Voltage: DC 9–24V Speed Range per Detection Point (Basic Range): 30–80,000 rpm Display: 4-digit 0.56 inch red digital tube Dimensions: 78 x 42 x 24 mm Panel Cutout Size: 76.5 x 39.5 mm Installation Type: Panel mount Operating Temperature: 0°C to 60°C Note: - Please allow 1–2 cm differences due to manual measurement. Ensure you are comfortable with this before ordering. - Due to variations in monitor displays, the actual color of the item may differ from the image. Package Includes: 1 x Tachometer