SMAKN RED 2 Wire Dc 3 50 30v LED Panel Digital Display Voltage Meter Voltmeter Automatically Adjust the Precision

weight: 16g Display color: Red/Yellow/Blue/Green/White Display mode: Three 0.56 LED digital tube update rate: About 500 ms/time Physical size: 48 x 29 x 21.5 mm (L*W* H) Opening size: 45.5 x 26 mm (L*W) Power supply: Don't need the power supply, direct use of the test voltage as a power supply Lead wire length: 14 cm The minimum input: 3.50V The maximum input: 30.0V Measurement range: DC3.50 - 30.0V Operation temperature: -10 degrees~65 degrees Measurement accuracy: ±(5‰ + 2 Digit) Red line:Power Supply +,Measure Voltage +,(3.50-30.0V DC) Black line:Power Supply -, Measure Voltage- Note:Because the truck battery is fully charged voltage of about 28V. Especially when the truck starts immediately, the pulse interference is likely to damage the module. This table does not fit 24V truck. So if you counter this situation, please select the 15-80V voltmeter.