Features:1. Mini size, high performance and fast reaction speed.2. 0.56" LED 4-dis display, clear and easy for readings.3. Rotate speed measuring range: 5-9999RPM; frequency range: 0-98990.1Hz.4. Setting s will be memorized when power off.5. Suitable for detecting the speed of every kind of motors. Rate Setting Instructions:1. Rate range: 1-99(default 01: display value is same with actual value; if the rate is 10, display value*10=actual value);2. When power on, the meter display "0";3. Pre "SET" on, display "1"; pre again, display "01"...4. When display "1", is measuring RPM; pre "ADD", from "1" to "2", when display "2", is measuring frequency; display "01" is for rate setting, short pre "ADD" for +1, long pre for +10;5. After setting the values, it will be stored if no operation in 10s;6. With 1 decimal point, that is when rotate speed is 1000RPM.Tips:User can set the appropriate rate so as to measure frequency, le than 100KHz (999.9*99=98990.1Hz).Specifications:1. Display: 0.56" 4-di LED2. Display Color: Blue / Green / Red (Optional)3. Rotate Speed Range: 5-9999RPM4. Frequency Range: 0-98990.1Hz5. Rate Setting Range: 1-99(default: 01)6. Reset Time: 10s7. Refresh Time: 120-1200RPM: 0.2~0.5s; 2400-9999RPM: 0.25~0.6. Accuracy: 5000RPM: Approx. 3RPM9. Input Signal: Voltage Signal, Active Contact Signal, NPN10. Power Supply: DC 8-15V11.Installation: Embedded12. Wiring: +12V: DC 8-15V Input Positive13. GDN: DC Power Negative14. IN+: Signal Input15. Panel Dimension: 72 * 36 * 20mm / 2.83 * 1.42 * 0.8inNote:The r is not included, this can not be used to test the car rotate speed separately.Package Contents:1 * Dial