Features 1、【Efficient Voltage & Resistance Measurement】: The TS4520 entry-level voltage and resistance tester accurately displays both voltage and internal resistance values, allowing users to conveniently record and view the measured resistance values and delete recorded data as needed, streamlining test workflows. 2、【TFT Display & Adjustable Backlit】: Equipped with a vibrant 1.77-inch TFT color display, the tester provides clear visual feedback. The intuitive interface, combined with adjustable display backlight brightness, enhances the usability and readability under various conditions. 3、【Display Value Calibration】: With voltage and resistance display value adjustable functions, the tester allows users to calibrate readings to improve the display accuracy and meet the accuracy requirements of the user. 4、【Versatile Configuration & Reset Functions】: Supporting screen display rotation adjust and factory reset function, the tester offers high flexibility in instrument operation, ensuring adaptability to different user preferences and troubleshooting needs. 5、【Automatic Shutdown Function】: Offering 1-9 minutes automatic shutdown time setting function, the tester helps conserve battery electricity while ensuring flexibility to adapt to individual user preferences and work scenarios. Specification Name: Voltage Internal Resistance Tester Material: plastics Working voltage: 5VDC (do not over-voltage powersupply), need to provide their own powersupply Powersupply interface: Type-C, need to provide their own powersupply cable Charging module: integrated ternary lithium battery charging module, you can purchase and add the built-in battery by yourself Energy consumption: 50mA Display screen: 1.77-inch TFT color display screen Test principle: AC 4-wire method Test fixture: A type USB to Kelvin clip Voltage test ranges: 0.001V~45.00V Maximum resolution 0.001V Voltage display fine-tuning: support Internal resistance measurement ranges: 0.1mΩ~20.00Ω Maximum Resolution: 0.1mΩ Internal resistance display fine-tuning: support Data recording: 6 groups of internal resistance data can be recorded, and automatic recording when disconnecting the test clamp. Auto shutdown: support 1-9 minutes standby time adjustment Backlight brightness: support 1-9 levels of display backlight brightness adjustment Item size: 70 * 90 * 28mm / 2.76 * 3.54 * 1.10in Item weight: 134g / 4.72ounce Package size: 155 * 100 * 40mm / 6.10 * 3.94 * 1.57in Package weight: 170g / 6.00ounce Package List Packing List: 1 * Voltage Internal Resistance Tester 1 * USB to Kelvin Clip Wire