Features High Accuracy Measurement: Ultra low cost, high accuracy meets most application requirements. It has good repeatability and high precision, and can be quickly adjusted to the value you want. Reverse Connection Protection: The power supply has reverse connection protection, and the reverse connection line will not burn. If reverse polarity is used, the instrument will not burn out, but the screen will not display anything. 3 Wire DC Digital Display Voltmeter Head: The measuring range is 0V‑99.9V, and the power supply range is DC 5‑30V. Enter the same value in the next rotation. It has good repeatability and high precision, and can be quickly adjusted to the value you want. High Brightness LED Display: The display devices all use high brightness LED digital tubes, and the display effect is good. The reading is clear and intuitive. It is also convenient to observe values in the dark. High Quality: It is manufactured by fully automatic SMD technology with superb craftsmanship. If the input voltage is higher than 30V, it may be permanently damaged. Specification: Item Type: Digital Display Voltmeter Material: PCB Size: Approx. 48 x 30mm / 1.9 x 1.2in Purpose: DIY Module Measuring Range: DC 0V-99.9V Power Supply Range: DC 5-30V (External Power Supply is Required) Maximum Input: DC 30.0V Allowable Error: ±1%; When Greater Than or Equal to 10V, The Error is ±0.3V; When Less Than 10V, The Error is ±0.10 Display Mode: Three Digit 0.56in LED Digital tTube Wiring: 3 wires, 20cm / 7.9in in length, the black wire is the shared negative pole; the red wire is the positive pole of the power supply voltage (DC 5~30V); the white wire is the positive pole of the measured voltage (DC0~100V) Working Temperature: -10℃~65℃ Package List: 2 x Module Package List 2 x Module