YB5135FT LED Digital Tachometer Intuitive Clear Display Interference Resistant for RPM Speed Measurement1. Anti Interference: This meter is designed to measure RPM speed, with digital filtering function and strong anti interference ability.2. Bright Screen: Accurate and precise measurement, high brightness LED screen gives you an intuitive and clear display.3. Excellent Features: 309999Rpm speed, DC5V, 12V supply voltage, high working efficiency and practical for use.4. Advantages: The shell adopts the standard embedded housing for easy installation, beautiful and elegant modeling.5. Performance: The meter has stable performance, simple circuit with high accuracy, high reliability and low power consumption.Specification:Item Type:DigitalLEDTachometerMaterial: ABSWorking Current: Speed: 30-9999RpmMeasurement Range: Frequency: 0.5-9999Hz /0.5-999.9Hz /0.5-99.99Hz (automatic or manual switch)Maximum Input Frequency: 10KHzDisplay Type: 0.56 in LED (Red)Input Pulse Signal: NPN/PNP (open collector, contact switch, non contact switch, level pulse)Input Signal Voltage: Low level: -30V-0.6V; High level: 4-30VSize: Approx: 79x43x25mm/3.11x1.69x0.98inMounting Hole: Approx: 75x39.5mm/2.95x1.55inWorking Environment:Operating Temperature: -10 - +60Working Humidity: 10 - 80% (no condensation)Working Pressure: 80 - 106kPaSunlight Exposure: Not direct exposureHow to Use:"Power+"arethenegativeandpositiveinputterminalsforthepanelmeterpowersupply,respectively."IN1"isthepositiveinputterminalforthemeasurementsignal.Inaddition,thenegativeinputterminalofthemeasurementsignalsharesaterminalwiththenegativeterminalofthepowersupplyofthepanelmeter.Package List:1 x DigitalLEDTachometer1 x AccessoryNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.