Good Performance: True 4-wire 1Khz AC sine battery internal resistance meter, with high sensitivity and accurate measurement. Paramenter: The maximum resolution of internal resistance is 0.00001, the maximum measurement range is 200.0. Large Range: The maximum voltage resolution is 0.00001V, and the maximum measurement range is 9.999V. Practical Function: Use ZR function to measure internal resistance below 5 milliohms, with higher accuracy and simple operation. Accurately Measures: Test lithium battery voltage can be displayed to 0.0001V, all ranges can be used for positive and negative measurement of voltage. Colour: as shown Material: plastic Package Contents: 1 * Battery internal resistance tester 1 * Clip 1 * Probe test line 4 * Needles 1 * 18650 Test stand Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.