Specifications: Mini size, high performance and fast reaction speed. 0.56inch LED 4-digits display, clear and easy for readings. Rotate speed measuring range: 5-9999RPM, frequency range: 0-98990.1Hz. Setting parameters will be memorized when power off. Suitable for detecting the speed of every kind of motors. Tachometer Rate Setting Instructions: Rate range: 1-99(default 01: display value is same with actual value; if the rate is 10, display value*10=actual value). When power on, the meter display "0". Press "SET" button, display "1"; press again, display "01". 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. After setting the values, it will be stored if no operation in 10s, return the selected function interface. With 1 decimal point, that is when rotate speed is 1000RPM. Type: Digital Tachometer Display: 0.56" 4-digit LED Rotate 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. 3RPM Input Signal: Voltage Pulse Signal, Active Contact Signal, PNP, NPN Power Supply: DC 8-15V Installation: Embedded Wiring: +12V: DC 8-15V Input Positive, GDN: DC Power Negative, IN+: Signal Input Features: Mini, 4 Digit Display, High Precision Panel Dimension: 72mm x 36mm x 20mm(Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Digital Tachometer