Features: It is a true four-wire measurement internal resistance meter, with precise, convenient to carry. The device can automatically test internal resistance and voltages values simultaneously, with measurement result displayed on the screen. Users can also manually adjust the voltages and resistance ranges. The product features sorting modes, automatically filtering the good and bad batteries base on user-set thresholds. It also supports historical records and exporting data tables of historical measurements. ①Short press to power on. ② long press to shut down. ③Adjust voltages. ④Adjust the resistance: short press to select resistance. ⑤Long press to enter, select Sorting Modes and to enter Sorting Modes. In sorting modes, there are 8 groups of customized threshold data groups, short press / to switching data groups, and / to select the threshold value to be set. In the sorting modes, test result will be automatically evaluated and compared with the set threshold interval to judge whether they pass or fail, so as to filter out the qualified devices, and the evaluation will also be automatically saved in the history record. ⑥Export data to the computer: the device through the USB to TYPEC cable connecting to the computer, at this time the disk inside the table is the recorded data. Specifications: Material: ABS Size:Approx.158.7x80.5x28.4mm/6.25x3.17x1.12inch Measuring ranges: Resistance: 20mΩ,200mΩ,2Ω,20Ω,200Ω; Voltages:1V,10V,100V Basic accuracy: resistance 0.5%, voltages 0.5% Builts in Battery:1000mAh Charging Port:USB C(5V1A) Package Includes: 1pc Battery Internal Resistance Tester note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.