Digital Tachometer,DC8 24V 30mA 4 Red/Blue LED Tachometer RPM Speed Meter+Hall Proximity Switch Sensor NPN (Red)

✔ 【UpgraDe Material】 - Digital LED tachometer adopts the latest A / D conversion chip and the high stabilIty benchmark IC, adopts electronic chip component, reasonable circuit design. ✔ 【Widely Application】 - It can be applied to the measurement of voltage, current and external sensor to measure temperature, pressure, displacement and other physical quantities. Suitable for all kinds of digital instrument display. ✔ 【Product Advantages】 - The external appearance adopts standard size and convenient to install. Good stability, high precision and strong anti-interference ability. ✔ 【Main Parameters】 - Input pulse NPN / PNP open collector, contact switch, contactless switch, level pulse. Input voltage: low level: -30V -0.6 V, high level: 4-30V. Measuring range: frequency: 9999Hz, 999.9 HZ, 99.99 KHZ, automatic switching selection. ✔ 【Perfect After-sales Service】 - We cherish every customer and commit to providing you with good service. If you have any questions about quality and instructions during use, we will be happy to assist you.