Feature:1. 4 DIGIT LED: The digital tachometer adopts 0.56in LED 4 digit display, which is easy for observation and reading, and is convenient and practical.2. WORKING RANGE: The speed measurement range is 59999RPM, the frequency range is 098990.1Hz, this tachometer has a wide range of applications.3. MULTIPLE FUNCTIONS: Setting parameters will be memorized in case of power failure, with 10s reset time, which has high accuracy and stable performance.4. EASY TO INSTALL: The 4 digit tachometer has a compact size, and adopts embedded installation, which is easy to install and takes up little space.5. WIDE APPLICATION: This speed meter is suitable for detecting the rotational speed of various motors, widely used in household or industrial equipment.Specification:Item Type: Digital TachometerMaterial: ABSUsage: Speed MeasurementDisplay: 0.56in 4 digit LEDSpeed Range: 5-9999RPMFrequency Range: 0-98990.1HzRate Setting Range: 1-99 (Default: 01)Reset Time: 10sRefresh Time: 120-1200RPM: 0.2-0.5s; 2400-9999RPM: 0.25-0.6sAccuracy: <5000RPM: About 2RPM; >5000RPM: About 3RPMInput Signal: Voltage pulse signal, active contact signal, PNP, NPNPower Supply: DC 8-15VInstallation: Embedded+12V: DC 8-15V input positiveGDN: DC power negativeInput+: Signal Input.Package List:1 x Digital Tachometer1 x Connection CableNote:The user can set the appropriate rate to measure frequency less than 100KHz (999.9 x 99=98990.1Hz).