6PCS 0.56" Digital Voltmeter Ammeter Battery Monitor DC 4.5-30V Voltage Meter Tester Two-Wire Small LED Voltmeter Display Voltage Tester for Solar Battery Electricity Monitor (Yellow)

Measure voltage: DC 3-30V (two wires Access).Input Polarity: DC voltageDimensions: 48mm x 29mm x 22mmRefresh rate: about 300mS / timesOperating temperature: -10°c to 65°cWire length: 20cmReverse Connection ProtectionMethod of wiring Red wire: PositiveBlack wire: NegativeMeasurement accuracy: Less than 10V, accurate to 0.01V; More than 10V, accurate to 0.1V (allowable tolerance: 1% +/- 1 word).If the input voltage is higher than DC30V, the voltmeter will be burnt.Please don't use this meter in 24V battery because when the battery is full-charged, its voltage will be about 30V.

• DC 3.5-30V 0.56 inches, no additional power supply, directly use the test voltage as a power supply. Input voltage higher than 30V will cause damage.
• Working current:red <23mA, green <18mA, blue <12mA.
• Red:positive;black:negative;lead length:20 cm.With reverse connection protection.