YB5135FT LED Digital Tachometer Intuitive Clear Display Interference Resistant for RPM Speed Measurement 12V Item Type: Digital LED TachometerMaterial: ABSWorking Current: <80mA Speed: 30-9999RpmMeasurement Range: Frequency: 0.5-9999Hz /0.5-999.9Hz /0.5-99.99Hz (automatic or manual switch) Maximum Input Frequency: 10KHz Display 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/3.11x1.69x0.98in Mounting Hole: Approx: 75x39.5mm/2.95x1.55in Working Environment: Operating Temperature: -10 - +60℃Working Humidity: 10 - 80% (no condensation) Working Pressure: 80 - 106kPa Sunlight Exposure: Not direct exposure