SMAKN&reg; 0.56" 2 Wire Green Dc 3.3-30v LED Panel Digital Display Voltage Meter Voltmeter 5V 12V 24V 27V Solar Battery Volt Accurate Power Monitor Gauge Measure voltage: DC 3.3-30V (two wires Access) Measurement precision:0.01V(3.3-10V); 0.1V (10-30V) Display: Three 0.56 Display color: Green Operating temperature: -10c to 65c