Internal Resistance Is An Important Indicator Of Battery Performance. Under Normal Circumstances, Batteries With Small Internal Resistance Have Strong Discharge Capacity. Support Current Discharge: Batteries With High Internal Resistance Have Weak Discharge Capabilities. Internal Resistance Is Like Age. Measuring The Internal Resistance Can Help Identify Battery Condition And Match Batteries. When Building Series-Connected Battery Packs, Cell Capacity, Internal Resistance, And Voltage Should Be Matched. The Performance Of The Battery Pack Follows The "Barrel Principle", Where Overall Performance Depends On The Weakest Battery. Basic Resistance Accuracy: 0.5% Basic Voltage Accuracy: 0.5% Resistance Measurement Range: 0.01μΩ to 200Ω Voltage Measurement Range: 0 to 100VDC Frequency: AC 1KHZ Current: 2MΩ/20MΩ Range 50mA; 200MΩ/2Ω Range 5mA; 20Ω/200Ω Range 0.5mA Serial Port: Must Be Enabled On The Instrument To Connect To A Computer For Communication. Disabled By Default. Baud Rate Is 115200 Resistance Range: 6 Ranges, Automatic And Manual Voltage Range: 3 Ranges, Automatic And Manual Display Update Rate: 5 Times Per Second Resistance Calibration: Each Range Manually Calibrated Independently Without Affecting Others Voltage Calibration: Each Range Manually Calibrated Independently Without Affecting Others Backlight: Yes Display Results: LCD Screen Display, Direct Reading Energy-Saving Settings: Auto Power-Off After 30 Minutes Of Inactivity Note: Different Batches May Vary Slightly In Product Appearance, Color, And Printed Characters, Which Does Not Affect Functionality Type: C With Probe Color: As Shown Material: ABS Size: Approximately 166x80x28mm Package Contents: 1 x Battery Internal Resistance Meter 1 x Probe Only The Above Items Are Included, Other Accessories Are Not Included Note: Lighting And Monitor Differences May Cause Slight Variations In Color Between Image And Actual Item. Measurement Allowable Error Is +/- 1-3cm