Digital LED Tachometer AC 230V 110V Digital RPM Tachometer for Motor with Sensor Proximity Switch Hall NPN

HIGH PRECISION MEASUREMENT: Measuring range: 10-9999; Measurement accuracy: ±0.1%, measured value ±1 word; Display refresh rate: >3 times/second Anti-Interference:Comes with Hall effect sensor and magnet, good stability, accurate Hall induction, reliable speed measurement, strong anti-interference ability. LED display: Equipped with a 4-bit digital LED display, making the speedometer clear and easily readable. RANGE OVEROVE DISPLAY: If the rotation speed is too low, "LLLL" is displayed; If the speed is too high, "HHHH" is displayed PLEASE NOTE: 1. Avoid strong electromagnetic interference; 2. When testing, the Hall switch and magnet must be firmly fixed, because otherwise vibration may occur, resulting in jump or inaccurate measurement, and the distance between the Hall switch and the magnet should be less than 10mm