Features ABS Housing:The ABS shell not only has good insulation, but also has a long service life. The shell made of it can perfectly protect the inner circuit board. More accurate: the scoreboard accepts 4 Hall signals, the digital display shows a circle, and the speed display is more accurate. MULTIPURPOSE The tachometer can also be used in other places to measure the speed. Only 4 magnets need to be attached to the object to be tested and then detected the rotation speed with the sensor. Anti-Interference Our speed indicator uses a Hall sensor and optimized circuit, which has strong anti-interference ability. Waterproof The induction part of the speed indicator uses waterproof glue to avoid water damage to the body, so you can use it with confidence. Specification: Item Type:Tachometer Material: ABS Display range: 0-9999 rpm. 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 magnets. Package List 1 x Tachometer 1 x Power Cable (Connected) 1 x Hall Sensor Probe (Connected) 4 x Magnet