<p><b>Parameter</b></p><p>Display color: Red</p><p>Display mode: Three 0.28 LED digital tube</p><p>Update rate: About 500 ms/time</p><p>Cutting size: 23mm x 14mm/0.9" x 0.55", Thickness: 10mm/0.39"</p><p>Mounting Hole Center Distance: 28mm</p><p>Power supply: Don't need the power supply, direct use of the test voltage as a power supply</p><p>Lead wire length: 10 cm</p><p>The minimum Voltage input: 3.50V</p><p>The maximum Voltage input: 30V</p><p>Working Voltage: DC 3V-30V</p><p>Measure Voltage : DC 3.5V-30V</p><p>Reverse protection: Yes</p><p>Operation temperature: -10 °C ~65 °C</p><p>Measurement accuracy: plusmn (1% + 2 Digit)</p><p><br></p><p></p><p><b>Wiring</b></p><p>Red Wire: Power supply +</p><p>Black Wire: Power supply -, Measured Voltage -</p><p>White Wire: Measured Voltage + (DC 3.5V-30V)</p><p><br></p><p></p><p><b>Package Included</b></p><p>6 PCS Mini Voltmeters 0.28'' 0-30V Red</p>