brand new and high quality Features: 1. The voltage internal resistance is measured simultaneously on the same screen, and the measurement is fast and stable. The minimum resolution can reach 0.01 milliohm, which is convenient for testing large capacity, high discharge rate and low internal resistance batteries. The range can reach 200 ohms, and it can measure low-capacity, small-current and high-resistance batteries such as button batteries and 9V stacked batteries. 2. The voltage and internal resistance functions have manual and automatic range functions respectively. The automatic range switching is stable and rapid, the measurement display is updated 4 times per second, and the range can be locked and displayed stably within 1S. The HOLD function helps you lock the display for easier reading. 3. Use dot for matrix LCD screen. The combination of large and small fonts can clearly display the measurement results and display rich content. 4.2 kinds of display modes. The normal mode displays the internal resistance and voltage on the same screen, and the sorting mode displays the internal resistance voltage and the classification and count of each level of battery. 5. Has a 3-level battery classification test. By setting the voltage internal resistance classification value, the batteries can be grouped. 6. Built-in lithium polymer rechargeable battery. And one more backup power interface is reserved, which can expand larger capacity. 7. Built-in charging management circuit. It can also set two charging currents, 200mA and 400mA. 8. Energy saving function. 5-60min shutdown delay can be set. When there is no operation or input, the over delay will automatically shut down. You can set a delay of 5-30min to enter low power consumption mode. When there is no operation or input, the over delay will automatically shut down. 9. Battery low voltage for protection. When the battery voltage is lower than 3V, it will automatically shut down, and low-voltage alarm when starting up. 10. Convenient and stable manual calibration and zeroing function. No need to open the meter, only precision resistance can be used to calibrate the internal resistance function. Each range is calibrated separately and does not affect each other. Long press the HOLD for key to start the one-key resistance zero function ZR (ZERO R), which can reduce the error when measuring low resistance values (for example, less than 5 milliohms), and help improve the accuracy of several milliohm resistance measurements. 11. Built-in factory range calibration information. The calibration settings can be restored at any for time, so you are not afraid of manual calibration failure. 12. The backlight brightness can be adjusted. The lighting for time can be set. You can choose off, push, and constant light modes. Brightness 10%-99%, for time 5S-60S. Specification: Product name: Internal Resistance Tester Range: 20m, minimum resolution: 0.01m, accuracy: 0.7%+7 (when ZR function is enabled) Range: 200m, minimum resolution: 0.1m, accuracy: 0.5%+5 Range: 2, minimum resolution: 1m, accuracy: 0.5%+5 Range: 20, minimum resolution: 10m, accuracy: 0.5%+5 Range: 200, minimum resolution: 0.1, accuracy: 0.6%+5 Voltage measurement: 2V, minimum resolution: 0.001V, accuracy: 0.8%+5 Voltage measurement: 20V, minimum resolution: 0.01V, accuracy: 0.8%+5 Voltage measurement: 28V, minimum resolution: 0.1V, accuracy: 0.8%+5 Materials: ABS Size: app.11cm/4.33in Optional Styles&Colors: A, B, C, D Quantity: 1set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: Style A: 1 x Tester + 1 x probe test line (suitable for measuring various types of batteries, good versatility. Twisted-pair wires improve anti-interference) Style B: 1 x Tester +1 x Kelvin clip (suitable for measuring lead ends, chip tabs, etc. The wires are convenient to twist and have better accuracy) Style C: 1 x Tester + 1 x probe test lead + 1 x Kelvin clip Style D: 1 x Tester +1 x 18650 test stand + 1 x Kelvin clip + 1 x probe test line (suitable for measuring a wide variety of batteries, corresponding to various situations)(other accessories demo in the picture is not included.)