Description: This tachometer, with mini size, high performance and fast reaction speed. Greatly suitable for detecting the speed of every kind of motors. It can precisely test the rpm value for motors. 0.56" 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. Specification: Display: 0.56" 4-digit LEDRotate 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 Size Chart: Panel Dimension: 72 x 36 x 20mm / 2.83 x 1.42 x 0.79inch If the signal of the proximity switch sensor is weak, it is recommended that the power supply of the switch sensor is not lower than 15V Opening size: length 68MMx33MM Installation method: Embedded Operating instructions for tachometer ratio setting: Ratio setting range: 1-99 optional, (the default ratio is 01, the displayed value is the same as the actual value, if the ratio is adjusted to 10, the displayed value*10=actual value.). Connect the power supply, the meter shows 0. Package Includes: 1 Piece Digital Tachometer Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.