Have good stability and high measurement precision. Strong anti-jamming capability. Setting parameters will be memorized when power is off. Standard size for easy installation. Suitable for detecting the speed of various types of motors. Specifications: Power requirement: DC 8-24V Measure range: 10 ~ 9999RPM Error range: 0.1% Clear zero: Automatic Clear zero time: About 10s Refresh frequency: 0.2-0.5S (120-1200RPM), 0.25-0.06S (2400-9999RPM) Response frequency: 100Hz Measure indication: (RPM less than 5000, 2), (RPM more than 5000, 3) Output type: NPN 5-wire normally open Display: 5 x 2cm LED Detection range: 1mm-10mm Proximity output current: 20mA (for the 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 vary slightly from the real thing. Measurement allowed error is +/- 1-3cm.