Features: True 4-wire AC sinusoidal measurements effectively refrain the effects of test leads and contact resistance. Two function interfaces, battery sorting function. Built-in battery, phone recharger charging, low power consumption + multiple power saving options. The test range is 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. Handmade, the appearance of the right side is overly cautious. True four-wire 1KHz AC sinusoidal battery internal resistance meter 0.00001 ohms-200 range. 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. Specifications: Material: ABS Color: black Battery: 1 * lithium battery, 2000mAh (included) Accuracy format: ±([accuracy percentage]+[least significant digit]) Range: 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 range of 5%-95% of the gear, when it is not within this range (less than 5% of the range of the gear range, or greater than 95% of the range of the gear range), the error may be greater than the above accuracy. Voltage measurement: ±(% reading +% range) Range: 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 drift 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)/℃ (28℃) Power consumption: <60mA (200mΩ and above range, when the power is 3.7V, the backlight is off) <120mA (20mΩ range, when the power is 3.7V, the backlight is off) <10mA (enter low power consumption mode) 0mA (shutdown) Package size: 120 * 60 * 40mm / 4.7 * 2.4 * 1.6in Package weight: 320g / 11.3ounce