Feature:1. 18 Bit AD Converter Chip: This battery internal resistance meter uses an 18 bit AD converter chip with high resolution to ensure accurate voltage and resistance measurements, making it very practical.2. High Resolution: This battery internal resistance test meter uses a dual five digits display and the measurement resolution is up to 0.0001m and 0.1mv, the display is very clear and easy to read.3. Multifunctional: This battery voltage tester analyzer is multifunctional, can be automatically switched between multiple units, has a wide measurement range, and automatically determines and displays battery polarity without distinguishing battery polarity.4. High Accuracy: This battery internal resistance tester uses a 1KHZ AC current measurement method, which is highly accurate and suitable for measuring all kinds of batteries or battery packs under 100V.5. Wide Application: This battery voltage tester has a wide range of applications and is equipped with a computer serial connection terminal, which extends the instrument's measurement and analysis functions, is convenient and rugged, and can be used for testing a variety of batteries.Specification:Item Type: Lithium Battery Voltage Resistance TesterMaterial: ABS, Aluminum AlloyPower Supply Current: 50ma-100maMeasurement Parameters: ACR, DCVMeasurement Range: R: 0-2000V: 0-100VDCResolution: 0.0001m (100), 0.1mv (100v)Accuracy: R: 0.5%V: 0.5%Testing Speed: 5 times/sTesting Range: Auto SwitchingMeasurement Input: Balanced SystemMeasurement Probe: LCR Kelvin 4 Wires Clamp.Package List:1 x Lithium Battery Voltage Resistance Tester1 x USB Cable1 x Battery Holder1 x Battery Clip Wire1 x Power Cord1 x ManualNote:Pay attention to the positive and negative poles of the battery for dust or oxidized layer. The positive and negative terminals of the battery must be wiped with fine sandpaper to reveal the metallic luster. Pay attention to whether the contact is good or not, otherwise the measured internal resistance value will be too large or different each time the measurement value.