Features 1、Anti Interference: Our speed indicator adopts Hall sensor and optimized circuit, which has strong anti interference ability. 2、Waterproof: The induction part of the speed display adopts waterproof glue to avoid water damage to the body, so you can use it with confidence. 3、More Accurate: The display board accepts 4 Hall signals, the digital display shows one circle, and the speed display is more accurate. 4、Multi Purpose: The tachometer can also be used in other places to measure the rotation speed. It only needs to attach 4 magnets to the object to be tested and then use the sensor to sense the rotation speed. 5、ABS Housing: The shell made of ABS not only has good insulation, but also has a long service life. The shell made of it can provide perfect protection for the inner 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