High Accuracy: The measurement range is 10-9999rpm with 0.1% accuracy. Clear zero time in about 10 seconds. Response frequency: > 3 times/second. Voltage: DC 12-24V, Current: 40mAClear & Easy Reading: Features a blue 4-digit LED display for clear and easy to read. The digital LED tachometer size is about 80*25*40mm(L*W*H)High Stability: Uses the latest A/D conversion chip, high stability reference IC, and stick chip components. Stable and fast response. Overrange display shows "1" or "-1" for thousands of units, with the last three digits not displayedSettable Parameters: Parameters are memorized when powered off. Ideal for detecting motor speedsExtensive Applications: The digital rpm gauge tachometer is suitable for measuring voltage and current, and can be an external sensor to measure temperature, pressure, displacement, and other physical quantities