1. Mini size, high performance and fast reaction speed. 2. 0.56 inch LED 4-digits display, clear and easy for readings. 3. Rotate speed measuring range: 5-9999RPM; frequency range: 0-98990.1Hz. 4. Setting parameters will be memorized when power off. 5. Suitable for detecting the speed of every kind of motors. 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. Press "SET" button, display "1"; press again, display "01"... 4. When display "1", is measuring RPM; press "ADD", from "1" to "2", when display "2", is measuring frequency; display "01" is for rate setting, short press "ADD" for +1, long press for +10; 5. After setting the values, it will be stored if no operation in 10s, return the function interface; 6. With 1 decimal point, that is when rotate speed is Less than 1000RPM, the rotate speed corrects to 1st digit after the decimal point; no decimal point when 1000RPM. Specifications: 1. Display: 0.56 inch 4-digit LED 2. Display Color: Red 3. Rotate Speed Range: 5-9999RPM 4. Frequency Range: 0-98990.1Hz 5. Rate Setting Range: 1-99(default: 01) 6. Reset Time: 10s 7. Refresh Time: 120-1200RPM: 0.2~0.5s; 2400-9999RPM: 0.25~0.6s 8. Accuracy: Less than 5000RPM: . 2RPM; 5000RPM: . 3RPM 9. Input Signal: Voltage Pulse Signal, Active Contact Signal, PNP, NPN 10. Power Supply: DC 8-15V 11.Installation: Embedded 12. Wiring: +12V: DC 8-15V Input Positive 13. GDN: DC Power Negative 14. IN+: Signal Input Material: ABS colour: black Package Contents: 1 x Digital Tachometer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Tachometer speedometer 4 Digital speedometer