SMAKN&reg; 2 Wire Green Dc 4.0-30v LED Panel Digital Display Voltage Meter Voltmeter Measure voltage: DC2.7-30V (two wires Access) Measurement precision:0.01V(2.7-10V); 0.1V (10-30V) Display: Three 0.56 Display color: Green Operating temperature: -10c to 65c