... to test contact resistance,battery internal resistance and voltage of battery simultaneously. AT520L applies to the ... by AT520 series. AT520L Battery Tester SPECIFICATIONSParametersAC resistance, DC voltage, ΘAccuracyResistance:0.5% Voltage: 0.1%Measurement RangeResistance: 10 ... Δ%, q, sorting resultMax ReadingResistance: 3,200(32/3), Voltage: 6,000Adjustment Short-circuit reset for all range, REL ...