A true four-wire 1Khz AC sinusoidal battery internal resistance meter. The maximum resolution of internal resistance is 0.00001ohm, and the maximum measurement range is 200.0ohm.The maximum voltage resolution is 0.00001V, and the maximum measurement range is +/-99.999V. Testing the lithium battery voltage can show a sufficiently high sensitivity, up to 0.0001V. Positive and negative measurement voltages can be used in all ranges.It can measure lead acid, lithium , lithium polymer, lithium iron phosphate, alkaline, dry battery, nickel metal hydride, nickel cadmium, button battery, etc.The product is an English display of precision: +/-([Percentage of Precision]+[Least Significant Digit])Range Maximum resolution Accuracy Display mode20mohm 0.01mohm 0.7%+7 22.00mohm200mohm 0.1mohm 0.5%+5 220.0 mohm2ohm 1mohm 0.5%+5 2.200 ohm20ohm 10mohm 0.5%+5 22.00 ohm200ohm 0.1ohm 0.6%+5 220.0 ohmWhen the gear is within the range of 5%-95%, the error may be the above accuracy when it is not in this range (less than 5% of the gear range, or 95% of the gear range).Voltage measurement: +/- (% reading +% range)Range Maximum resolution Accuracy Display mode1V 0.00001V 0.15+0.015 .99999V10V 0.0001V 0.15+0.010 9.9999V100V 0.001V 0.15+0.015 99.999VPositive and negative symmetry error +/-(0.012%+5 words)Temperature drift within normal use temperature (10Celsius-40Celsius) 100ppm/CelsiusNote: use, read the instructions and the instructions on the back of the instrumentIt is forbidden to input AC signals and DC voltages higher than 100V.The machine does not have a charger, it can be with an Android phone chargercolour:Black+redMaterial:plasticPackage Contents:1 x Tester (Engli version)1 x Kelvin clip test lead1 x Four-needle test pen (fine needle type)1 x test stand