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DROK 100A DC Amp MeterFeatures: Cutting size: 45.5mm x 26.5mm Dimensions: 48mm x 29mm x 21mm Measuring range: DC 0-99.9A Measurement Accuracy: +/-(1% +2 digits) (Measure 75mV) Supply voltage: DC 7-30V (2 wires Access) Display: Three 0.56" LED digital tube Display color: Blue Refresh rate: about 500ms/ Wiring: POWER: Power supply DC 7-30V, Red: Battry Power + , Black: Shunt- INPUT: Measure Current DC 0 ~ 100A, Red(bigger): Shunt+ , Black(bigger): Shunt- Please refer to the picture above Package Includes: 1x Digital Ammeter 1x Current Shunt 100A/75mV