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Technical Specification: Resolution: Voltage 10mV, Current 1mA Operating Range: V = 3~7.5V, I = 0~2.5A Max 5 Amp Full scale drop: ( When measuring current ) 200mV Error: voltage <± 1% current <± 2% Compact and easy to carry , no additional power supply. Perfect for finding faulty charging wires -- or faulty USB charging plugs.