1. High-definition display: 1.77-inch TFT high-definition color screen display, the panel is clearly visible 2. Automatic recording function: intelligently record 6 sets of data, easily complete the measurement work 3. Energy saving mode: click the M function key to switch to the backlight setting display brightness is adjustable 4. The host in the non-measurement state automatically shut down after 15 minutes 5. The product is compact and widely used Product name:TS4520 voltage internal resistance tester (Note:It is forbidden to test AC power and voltage above 45V) Working voltage:DC5V (do not overvoltage power supply), self-provided power supply is required Power supply interface:Type-C, self-provided power supply line is required Built-in battery:no built-in battery Charging module:integrated ternary lithium battery charging module, built-in battery can be installed by yourself Working energy consumption:50mA Display screen:1.77-inch TFT color display Test principle:AC 4-wire method Test fixture:Type A USB to Kelvin clip Voltage test range:0.001V-45.00V Voltage maximum resolution 0.001V Voltage display fine-tuning:Support Internal resistance measurement range:0.1mohm-20.00ohm Resistance maximum resolution 0.1mohm Internal resistance display fine-tuning:Support Data recording:Can record 6 sets of internal resistance data, automatically record when disconnecting the test clip Auto shutdown:Support 1-9 minutes standby time adjustment Backlight brightness:Support 1-9 levels of display backlight brightness adjustment Line length:USB to Kelvin clip test line (650mm) Colour:As Shown Material:Plastic Package Contents: 1 * Voltage internal resistance tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.