3pcs Mini Digital Blue + Red-led DC Current Meter Voltmeter With 50A Ampere Shunt

Feature Operating voltage DC 4 5 30V Measure voltage DC 0 100V Minimum resolution V 0 1V Measure current 50A require external shunt Minimum resolution A 0 1A Operating current 20mA Display three 0 28 LED digital tube Display color Red and Blue two color display Dimensions 48 x 29 x 21mm Mounting cutout 45 5 x 26 5mm Refresh rate about 500mS times Measure accuracy 1 1 digit Operating temperature 10 to 65c Operating Humidity 10 to 80 non condensing Working pressure 80 to 106 kPa Applications Suitable for automotive electric cars motorcycles battery monitoring or other products voltage current measurement Wiring Black line thin vacant or buck circuit module negativeRed line thin power supply Black line thick COM common measuringRed line thick PW measuring terminal voltage input positiveYellow line thick IN current input Notice The voltage between the thin red and thin black lines must be within DC 4 5 30V The ammeter can only be connected to the negative of the device under test Exceeds 5A long term full load working continuously it is recommended that the measurement side of the leads are directly soldered to the socket When the black thin line vacant it is better to use insulating tape around the exposed part of the wire to prevent short circuits If just be used as a voltmeter it is recommended that the yellow line and the black line were connected together to prevent the ammeter d