Features 1、Voltage Meter: With this voltage meter, you can easily measure the volt of circuit, very reliable and convenient. 2、High Accuracy: The detection rage is 0‑30V, meanwhile 3% measuring accuracy ensures small error for your working. 3、Clear Display: 0.28in LED screen allows for clear digital display, which largely simplifies the operation as well. 4、Safer Working: Designed to have reverse connection protection, the voltmeter has better work safety and stability. 5、Easy to Install: Comes with a compact size as well as a light weight, the installation can be quickly completed. Specification Item Type: Voltmeter Operating Current: <20 mA Detection Rate: ≥200 mS/time Mounting Hole: Approx. 28.5 x 10mm / 1.12 x 0.39in Measurement Accuracy: 3% Working Temperature: -10~+65℃ Size: Approx. 33 x 10 x 7mm / 1.3 x 0.39 x 0.28in Working Pressure: 80~106kpa Working Humidity: 10~80% Red Wire: Power+ Black Wire: Power- Package List 1 x Voltmeter