Feature: 1. SWITCHABLE RANGE: Voltage and internal resistance are displayed on the same screen, and the range can be manually and automatically switched 2. FOR VARIOUS BATTERIES: The minimum resolution can reach 0.01 milliohms, and the maximum range is 200 ohms, can measure low resistance lithium batteries, acid batteries and high resistance coin cells 3. FAST AND STABLE: This tester can be updated 4 times per second, and the range is stable in 1 second. Readings can also be locked. With battery sorting function 4. 400MA CURRENT CHARGING: Can be charged by USB with 400ma current. The screen shows the battery voltage, please charge when lower than 3.5v 5. WIDE APPLICATIONS: Can measure acid, lithium ion, lithium polymer, lithium iron phosphate, alkaline, dry battery, nickel metal hydride, nickel cadmium, button battery, etc. 6. LOW RESISTANCE FUNCTION OF 0.30‑0.50 MILLIOHMS: Short press the power button to turn on the low resistance function and measure the internal resistance of 0.30‑0.50 milliohms Specification: Item Type: Lithium Battery Internal Resistance Tester Material: ABS Battery: Built in polymer lithium battery 2000mAh Charging Current: 400ma Internal Resistance Measurement(0.01mΩ-200Ω range, automatic or manual range switching): Range Minimum Resolution Accuracy 20mΩ 0.01mΩ 0.7%+7(Turn on low resistance function) 200mΩ 0.1mΩ 0.5%+5 2Ω 1mΩ 0.5%+5 20Ω 10mΩ 0.5%+5 200Ω 0.1Ω 0.6%+5 Range Minimum Resolution Accuracy Positive negative 6V 0.001V 0.1%+5 Positive negative 45V 0.01V 0.1%+5 . Package List: 1 x Host1 x Probe1 x Test Clip1 x Four Wire Frame Note: 1. Within the range of 5%‑95% of the level, when not within this range (less than 5% of the range of the level, or greater than 95% of the level of the gear), the error may be greater than the above accuracy.2. Do not knock to cause irreversible damage.