1. Voltage display fine-tuning: our voltage tester supports voltage display fine-tuning function, which allows users to adjustments to the measurement results to accurate readings and meet the needs of professional-level testing. 2. internal resistance display fine-tuning: also with internal resistance display fine-tuning function, whether it is a small resistance or large resistance measurement, can easily realize the precise adjustment, improve the accuracy and reliability of the test. 3. Adaptive visual experience: 1-9 grades of backlight brightness adjustment design, whether working in bright light environment or dim conditions, users can adjust the screen brightness to the most comfortable state according to the actual situation, to protect eyesight and enhance the ease of operation. Note: Prohibit the test of AC power, prohibit the test of more than 45V voltage Working voltage: DC5V (do not over-voltage power supply) Test principle: AC 4-wire method Voltage testing range: 0.001V-45.00V Maximum resolution 0.001V Internal resistance measurement range: 0.1mΩ-6.999Ω Maximum resolution 0.1mΩ Data Recording: Support recording 5 groups of internal resistance measurement data. Voltage display fine-tuning: support Internal resistance display fine-tuning: support Auto shutdown: Support 1-9 minutes standby time adjustment. Backlight Brightness: Support 1-9 levels of display backlight brightness adjustment. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Black Material:plastic Specifications:A: meter + 4P cable Package Contents: 1 x host with cable (the cable color is random, no specified color is accepted) 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.