Feature:
1: 4-digits display, clear and easy for readings2: With good stability, high accuracy, anti-interference ability.
3: Using the latest A/D conversion chip, high stability reference IC and stick chip components.
4: It can be applied to voltage and current measurement, also can be an external sensor to measure temperature,
pressure, displacement and other physical quantities
5: Setting parameters will be memorized when power off.
6: Suitable for detecting the speed of every kind of motors.
7: Over-range display: the thousand unit display "1" or "-1", the last three do not show.

Specifics:
Condition: 100% Brand New
Material: Plastic
Display type: LED display
Voltage: DC8-24V
Current: 40mA
Measurement range: 10-9999rpm
Accuracy: 0.1%
Clear zero time: About 10s
Display refresh rate: >3 times/sec
LED color: Red / Blue / Green
Sensor wire length: 1M

Note:
1. Connect the plug correctly according to the wiring diagram.
2. The Hall switch is NPN normally open type, and the detection distance of the Hall switch needs to be within 10MM. The Hall switch installation diameter is 12MM, and the wire length is 1M.
3. Strong electromagnetic interference should be avoided. It is better to use shielded wire or twisted pair for the measurement wire.
4. The count signal of the counter and the switch or circuit of the reset signal input should be as close as possible to the terminal of the counter, and the signal line should be as short as possible.
5. Avoid the same tube or twisted wiring with other such as: strong electric wire or power wire, etc., to avoid unnecessary interference, please use shielded wire if necessary, and the shielding layer is connected to the counting terminal "+".
6. It is not recommended to use mechanical switches or micro switches, because their lifespan is relatively short, and it is easy to miscount after a long time;
if you use mechanical switches or micro switches, please try to use better quality, so as to avoid miscounting, strong A magnetic switch is recommended.

Package Included:
1 x LED Tachometer
1 x NPN hall proximity sensor
1 x Magnet