1. Anti-interference: This meter is designed to measure RPM speed, with digital filtering function and strong anti-interference capability. 2. Bright Display: Accurate and precise measurement, high-brightness LED display provides you with an intuitive and clear display. 3. Excellent Features: 30-9999Rpm speed, DC5V, 12V power supply voltage, high work efficiency, and practical for use. 4. Advantages: The shell adopts standard built-in 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. Item Type: Digital LED Tachometer Material: ABS Working Current: <80mA Speed: 30-9999Rpm Measurement Range: Frequency: 0.5-9999Hz /0.5-999.9Hz /0.5-99.99Hz (automatic or manual switching) Highest Input Frequency: 10KHz Display Type: 0.56 in LED (Red) Input Pulse Signal: NPN/PNP (open collector, contact switch, proximity switch, level pulse) Input Signal Voltage: Low level: -30V-0.6V; High level: 4-30V Size: 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 1 x Digital LED Tachometer 1 x Accessory