Feature: 1. True 4-wire AC sinusoidal measurements effectively refrain the effects of test leads and contact resistance. 2. With two function interfaces, support battery sorting function. 3. Built-in battery, cellphone chargepal charging function, low power consumption and multiple power saving options. 4. Support tests up to 200 ohms with a minimum resolution of 0.01 milliohms and less than 5 milliohms. 5. Press HOLD to enable the ZR function to measure small internal resistance as low as 0.30-0.50 milliohms. 6. True four-wire 1KHz AC sinusoidal battery internal resistance meter 0.00001 ohms-200 ranges. 7. It can measure plumbic acid, lithium ion, lithium polymer, lithium iron phosphate, alkaline, nickel hydrogen, nickel cadmium, button battery, etc.The ZR function measures below 5 ohms, and the internal resistance is more accurate. 8. The ZR function measures below 5 ohms, and the internal resistance is more accurate. Specification: Material: ABS Color: black Battery : 1 * lithium battery , 2000mAh (included) Accuracy format: ±([accuracy percentage]+[least significant digit]) Ranges: 20mΩ/200mΩ/2Ω/20Ω/200Ω Maximum resolution: 0.01mΩ/0.1mΩ/1mΩ/10mΩ/0.1Ω Accuracy: 0.7%+7/0.5%+5/0.5%+5/0.5%+5/0.6%+5 Display mode: 22.00mΩ (when ZR function is enabled)/220.0mΩ/2.200Ω/22.00Ω/220.0Ω In the ranges of 5%-95% of the gear, when it is not within this ranges (less than 5% of the ranges of the gear ranges, or greater than 95% of the ranges of the gear ranges), the error may be greater than the above accuracy. Voltage measurement: ±(% reading +% ranges) Ranges: 1V/10V/100V Maximum resolution: 0.00001V/0.0001V/0.001V Accuracy: 0.15+0.015/0.15+0.010/0.15+0.015 Display mode: .99999V/9.9999V/99.999V Positive and negative symmetry error ±(0.012%+5 words) Temperature shift within normal use temperature (10℃-40℃) 100ppm/℃ Maximum voltage between any terminals: 100V Display: internal resistance figures: 2000 counts Voltage figures: 99999 counts update 4 times per second Temperature: working: 10℃-40℃, storage: -20℃-60℃ internal resistance temperature coefficient: 0.1 * (prescribed accuracy)/℃ (<18℃ or >28℃) Power consumption: <60mA (200mΩ and above ranges, when the power is 3.7V, the backlight is off) <120mA (20mΩ ranges, when the power is 3.7V, the backlight is off) <10mA (enter low power consumption mode) 0mA (shutdown) . Package List: 1 * Tester 1 * Pair of Clip 1 * Pair of Test Pen 1 * Bracket