Description:                                       Features:                       brand new 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.