Features: Voltage resistance and screen measurement at the same time, fast and stable measurement. Minimum resolution up to 0.01 milliohm, easy to test high capacity, high rate discharge low internal resistance batteries. Range up to 200 ohms, can measure low-capacity, low-current, high internal resistance batteries such as button batteries and 9V stacked batteries. Voltage, internal resistance test function respectively, with manual automatic range function. Automatic range switching stable and fast, measurement display updated 4 times per second, basically can be locked in about 1S time range stable display. HOLD function helps you lock the display, more convenient to read. Adopt dot matrix LCD screen. Size font combination, can clearly display both measurement results and rich content. 2 display modes. Normal mode screen displays internal resistance and voltage, and binning mode displays the level of internal resistance voltage and battery sorting count. With three levels of battery rating detection. By setting the withstand voltage rating, the batteries can be grouped. Built-in charge management circuit. And two charging currents of 200mA and 400mA can be set. Energy saving function. 5-60 minutes shutdown delay can be set. No operation and input, over-delay automatic shutdown. Can be set to 5-30 minutes delay into low power mode. Specifications: Material: Plastic Voltage measurement: 4V/40V Maximum resolution: 1mV/10mV Accuracy: 0.8%+5/0.8%+5 Display mode: 4.400V/44.00V Internal resistance measurement range: 20m/200m/2/20/200 Maximum resolution0.01m/0.1m/1m/10m/0.1 Accuracy0.7%+7/0.5%+5/0.5%+5/0.5%+5/0.6%+5 Display mode: 22.00m/220.0m/2.200 /22.00/220.0 Battery: 3.7V, 2500mAh Package size: 120 * 60 * 40mm / 4.7 * 2.4 * 1.6in Package weight: 300 g / 10.6 oz YR1035 plus packing list: 1 * Internal resistance test instrument