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 for dc voltage higher than 100 v. Specification: Internal resistance measurement: Precision format: ([precision percentage] + [least significant digit] Range minimum resolution accuracy 20m 0.01m 0.7%+7 (when ZR function is enabled) 200m 0.1m 0.5%+5 2 1m 0.5%+5 20 10m 0.5%+5 200 0.1 0.6%+5 In the range of 5%-95% of the gear position, if it is not within this range (less than 5% gear range range, or greater than 95% gear range range), the error may be greater than the above accuracy Voltage measurement: Range Accuracy (% reading + % range) 1V 0.15+0.015 10V 0.15+0.010 100V 0.15+0.015 Positive and negative symmetry error (0.012% + 5 words) Temperature drift within normal use temperature (10C-40C) 100ppm/C Color: As pictures shown. Size: app. 6x17cm(2.36x6.69in) Quantity: 1 set Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Host 1 x 18650 Test Rack 1 x Kelvin Clip 1 x Probe Test Line(suitable for measuring battery type is more, corresponding to a variety of situations) (other accessories demo in the picture is not included.)