Features Good Anti-interference: Our digital tachometer adopts Hall sensor and optimized circuit, which has strong anti-interference ability. Waterproof and Dustproof: The induction part of the speed tester adopts waterproof glue to avoid water damage to the body, so you can use it with confidence. Accurate Measurement: The tachometer display board accepts 4 Hall signals, the digital display shows one circle, and the speed display is more accurate. One Machine for Multiple Purposes: The digital tachometer can also be used to measure the speed in other places, just stick 4 magnets on the measured object, and then use the sensor to sense the speed. ABS Material: This tachometer with hall sensor probe adopts a casing made of ABS, which not only has good insulation, but also has a long service life, and the casing made of it can provide perfect protection for the internal circuit board. Specification: Item Type: Tachometer Material: ABS Display range: 0-9999rpm Applicable Power Supply: DC 5V Applicable: Mainly used for 210, 8 x 16, 220 x 400, 220 x 600, 220 x 750, 7 x 12, 7 x 14, 0618, CJ18A and other lathes Package List: 1 x Tachometer 1 x Power Cable (Connected) 1 x Hall Sensor Probe (Connected) 4 x Magnet Package List 1 x Tachometer 1 x Power Cable (Connected) 1 x Hall Sensor Probe (Connected) 4 x Magnet