<p>Sincereetali</p>This tachometer, with mini size, high performance and fast reaction speed, is perfectly suitable for detecting the speed of all types of motors. It can accurately test the RPM value of motors. Features: Mini size, high performance and fast reaction speed. 4-digit 0.56 LED display, clear and easy for readings. Rotational speed measuring range: 5-9999 RPM; Frequency range: 0-98990.1Hz. The setting parameters will be memorized when power off. Suitable for detecting the speed of all types of motors. Tachometer Rate Setting Instructions: 1. Rate range: 1-99 (default 01: the display value is the same as the actual value; if the rate is 10, the display value * 10 = actual value); 2. When power on, the meter displays 0; 3. Press SET button, display 1; press again, display 01... 4. When display 1, measure RPM?; press ADD, from 1 to 2, when display 2, measure frequency?; display ??01?? is for rate setting, short press ??ADD?? for +1, long press +10?; 5. After setting values, it will be stored if no operation in 10s, return the selected function interface; 6. With 1 decimal point, i.e. when rotation speed is <1000RPM, rotation speed corrects to the 1st digit after decimal point?; no decimal point when >1000RPM. Tips: User can set the appropriate rate to measure the frequency, less than 100KHz (999.9*99=98990.1Hz). Specifications: Display: 0.56 LED 4-digit Display Color: Blue/Green/Red (optional) Rotation Speed Range: 5-9999RPM Frequency Range: 0-98990.1Hz Rate Setting Range: 1-99 (default: 01) Reset Time: 10s Refresh Time: 120-1200RPM: 0.2~0.5s; 2400-9999RPM: 0.25~0.6s Accuracy: <5000RPM: approx. 2RPM; >5000RPM: approx. 3 rpm Input Signal: Voltage pulse signal, active contact signal, PNP, NPN Power Supply: DC 8-15V Installation: Built-in Wiring: +12V: DC 8-15V Input Positive GDN: DC power negative IN+: Signal input Panel Dimension: 72*36*20mm/2.83*1.42*0.8in Item Weight: 25g/0.88oz Note: The sensor is not included, this tachometer can not be used to test the rotation speed of the car separately. Package List: 1 * Digital Tachometer