Has good stability and high measurement precision with strong anti-jamming capability. Parameters are retained when powered off. Standard size for easy installation. Suitable for detecting the speed of various motors. Specifications: Power requirement: DC 8-24V Measurement range: 10 ~ 9999 RPM Error range: 0.1% Zero adjustment: Automatic Zero adjustment time: Approximately 10 seconds Refresh frequency: 0.2-0.5 seconds (120-1200 RPM), 0.25-0.06 seconds (2400-9999 RPM) Response frequency: 100 Hz Measurement indication: (RPM less than 5000, ±2), (RPM more than 5000, ±3) Output type: NPN 5-wire normally open Display: 5 x 2 cm LED Detection range: 1 mm - 10 mm Proximity output current: 20 mA (for sensor) Operating temperature: -10 to 50 °C Sensor wiring: Brown (Power+), Black (Test+), Blue (Signal) Color: Black Material: Plastic Package Contents: 1 x Tachometer RPM Speed Meter 1 x Hall Proximity Switch Sensor NPN Note: Light and different displays may cause the color of the item in the picture to differ slightly from the actual product. Measurement allowed error is +/- 1-3 cm.