1、BATTERY TESTER: Lithium battery digital display monitor, which can measure battery voltage and internal resistance, with a wide measurement range. 2、SIMPLE CHARGING: The battery tester is small and portable, has built in 3.7V 1000mAh rechargeable backup lithium battery, with Type C charging interface. 3、LCD DISPLAY: With HTN wide viewing angle LCD display screen, the operation is simple and clear at a glance, and has intelligent detection prompts. 4、APPLICABLE BATTERY: This tester can be used to measure the voltage and internal resistance of 18650 lithium battery and AA or AAA alkaline battery. 5、MULTIPLE USAGES: Used for battery production line test, warehouse battery sampling inspection, photovoltaic inverter, battery maintenance, DIY electronics. Item Type: Battery Voltage Resistance Meter Material: ABS Power Supply: Built in 18650 lithium ion rechargeable battery Battery Capacity: 1000mAh Measuring Range: 0-999MΩ Power Supply: 5V Test Voltage: 0.5-9.99V (forward); -0.5-(-9.9V) (reverse) Accuracy: ±1% Repeat Error: ±1% Application: Battery production line test, warehouse battery sampling inspection, photovoltaic inverter, battery maintenance, electronic DIY 1 x Battery Voltage Resistance Meter 1 x User Manual