["brand new and high quality.\r\nDescription:\r\n● High precision and high reliability for high-end applications.\r\n● It has reverse connection for protection and will not burn.\r\n\r\nSpecifications:\r\nMeasure voltage: DC 0 ~ 100V\r\nMeasure current: 0-50A\r\nOperating voltage: DC 4 ~ 30V\r\nVoltage error: ±0.1%\r\nCurrent error: ±1%\r\nExternal shunt specification: 75 mΩ\r\nOperating current: <20mA\r\nRefresh rate: about 300mS / times\r\nDisplay: three 0.28\" LED digital tube\r\nDisplay color: A(red+red), B(red+blue)\r\nLead Length: 15cm\r\nDimensions: 48 x 29 x 22 mm, length X width X thickness\r\nOpening Size: 46 x 27 mm\r\nNet weight: 20g\r\nWorking Temperature: -10°C~65°C\r\n\r\nWiring: \r\nBlack line (thin): vacant or for buck circuit (module) negative \r\nRed line (thin): positive pole of power supply \r\nBlack line (thick): COM, common measuring terminal \r\nRed line (thick): PW+, input terminal of measuring positive voltage \r\nYellow line (thick): IN+, the positive of current input \r\n(Please refer to the wiring diagrams for more details) \r\n\r\nNotice: \r\nThe voltage between the thin red and thin black lines must be within DC 4.5-30V \r\nThe ammeter can only be connected to the negative of the device under test and can only test amp in positive direction \r\nExceeds 5A, long-term full load working continuously, we recommended test side of leads directly soldered to the socket \r\nWhen black thin line vacant, it is better to use insulating tape around exposed part of wire to prevent short circuits \r\nIf just used voltmeter, we recommended yellow line and black line connected together to prevent ammeter's digit flashing\r\n\r\nPackage includes:\r\n1x Digital Volt/Ampere Meter \r\n1x Current Shunt"]