Feature: 1. Accurate Testing: This tachometer has the characteristics of fast and accurate response speed, good stability, and can accurately test the speed and frequency values of the motor. 2. Clear Reading: The Tachometer is 0.56 inch, and the display screen is 4 digital display. The number is clear and the display is fast, which is convenient for you to read data and know the speed. 3. Wide Application: The digital frequency tachometer has a speed measurement range of 5 to 9999RPM and a frequency range of 0 to 98990.1 Hz, which is suitable for speed detection of various motors. 4. Strong Anti Interference: Digital Tachometer has strong anti interference ability, which can avoid external magnetic interference and other confounding. Even if the input current is strong, it can also be free from interference, and the frequency and speed measurement accuracy is high. 5. Two Modes: The frequency Tachometer can switch the working mode by pressing the key, including frequency and speed. The setting parameters will be memorized when the power is cut off. Specification: Item Type: Frequency Motor TachometerDisplay: 0.56 in four position LED Speed Range: 5 to 9999RPM Frequency Range: 0 to 98990.1 Hz Rate Setting Range: 1 to 99 (default 01) Reset Time: 10 Refresh Time: 120 to 1200RPM: 0.2 to 0.5s; 2400 to 9999 rpm: 0.25~0.6 s Accuracy:<5000RPM: about 2RPM;> 5000 rpm: approximately 3 rpm Input Signals: Voltage pulse signal, active contact signal, PNP, NPN Power Supply: DC 8 to 15V Installation: Embedded Connection: +12V: DC 8 to 15V input positive pole GDN: DC power supply negative +: Signal input. Package List: 1 x Frequency Motor Tachometer1 x Connection Line