High precisionHigh accuracy in percent ( 1 digit). The grounding cable of the test end and the power supply connection is the same. Quick update of approx. 500MS/Time Connection ProtectionWith reverse polarity protection. If the positive and negative pole are swapped, the LED indicator is not damaged. Built-in shunt: the 10A voltage and current meter itself has a built-in shunt. 2 Colors for DifferentiationDisplay voltage and current simultaneously in different colors, red for voltage, blue for current (the current is measured in the negative rail). Wide ApplicationDC Ammeter has a convenient connection option and wide application. It can be used to monitor batteries, adjustable DC power supply, or to change the voltage and current status of another device. Specification: Voltage measuring range: DC 0V-100V. Current test range: 0-10A. Supply voltage range: DC 4-30 V. (Note: if the voltage exceeds 30V, external independent power supply is required.) Voltage error: 0.1%. Current error: 1%. Working current: