... to measure battery terminal voltage and internal resistance. The internal resistance is measured with the international standard AC ... impact of the test probe of the contact resistance of the instrument, the wire and battery output ... (2~19.99V)10mV, (20~100V)100mVInternal Resistance Measurement Range:0~199.9m ohm, 200~1, ... 999m ohm, 2~19.99 ohmInternal Resistance Resolution:(0~199.9m ohm)0.1m ohm, ...