4 Digital LED Display Tachometer RPM Speed Meter Panel Inductive Hall Effect Sensor NPN Proximity Switch Red/Blue(Blue)

Measure varied motor RPM Measure range: 10-9999 RPM Come with hall sensor and magnet, good stability, high Accuracy and strong anti-interference ability Input pulse NPN/PNP open collector ,contact switch, contactless switch, level pulse Input voltage: low level: -30V -0.6 V, high level: 4-30V The external appearance adopts standard size, convenient to install and easy to use Measuring range: frequency: 9999Hz, 999.9 HZ, 99.99 KHZ, automatic switching selection