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 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 1 x Host1 x Probe1 x Test Clip1 x Four Wire Frame Item Type: Lithium Battery Internal Resistance Tester Material: ABSBattery: Built in polymer lithium battery 2000mAhCharging Current: 400maInternal 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 Voltage Measurement(automatic or manual switching range): Range Minimum Resolution Accuracy Positive negative 6V 0.001V 0.1%+5 Positive negative 45V 0.01V 0.1%+5