Description: Features: and high quality True 4-wire AC sine measurement, effectively avoid the influence of the test line and contact resistance. Two functions interface, the original battery sorting function. Built-in battery, mobile phone charger to charge, low power consumption + a variety of power-saving options. Test range up to 200 ohms with a minimum resolution of 0.01 milliohms and less than 5 milliohms. Press HOLD to enable the ZR function to measure internal resistance as low as 0.30-0.50 milliohms. It can measure lead acid, lithium ion, lithium polymer, lithium iron phosphate, alkaline, dry battery, nickel hydrogen, nickel cadmium, button battery and so on. Note: Read the instructions and instructions on the back of the instrument before using. It is forbidden to enter the ac signal and the dc voltage higher than 100 v. Specification: Internal resistance measurement: Precision format: ± ([precision percentage] + [least significant digit] Range minimum resolution accuracy 20mΩ 0.01mΩ 0.7%+7 (when ZR function is enabled) 200mΩ 0.1mΩ 0.5%+5 2Ω 1mΩ 0.5%+5 20Ω 10mΩ 0.5%+5 200Ω 0.1Ω 0.