Digital LED Tachometer External Sensor Compatible LED Tachometer with NPN Proximity Switch for Speed Detection

1.4-digits display, clear easy for readings. 2.Mini size, high performance fast reaction speed. 3.With good stability, high accuracy, anti-interference ability. 4.Using the latest A/D conversion chip, high stability reference IC chip components. 5.It can be applied to voltage current measurement, also can be an external sensor to measure temperature, pressure, displacement other physical quantities. .Setting parameters will be memorized when power off. 7.Suitable for detecting the speed of every kind of motors. 8.Over-range display: the thousand unit display"1" or"-1", the last three do not show. Input pulse signal: NPN/PNP open collector, contact switch, non-contact switch, level pulse. Input signal voltage: low level:-30V-0.6V, high level: 4-30V Measuring range: Speed: 10-9999Rpm Measurement accuracy:±0.1%, reading±1 word. Display mode: 0.56 red, green, blue LED four-digit reading Display refresh rate:>3 times/second Working power supply: DC8-24V, 30mA, another 5v power supply version Dimensions: 79×42×25mm Installation size: 76×39mm Weight: about 50g Sensor: about 50g Over-range display: the first digit displays"1" or"-1", and the last three digits do not display Package Included: 1 x New GREEN LED Tachometer RPM Speed Meter 1 x Hall Proximity Switch Sensor NPN