1. Voltage display fine-tuning: Our voltage tester supports voltage display fine-tuning, allowing users to adjust measurement results for accurate readings and meet professional-level testing needs. 2. Internal resistance display fine-tuning: Features internal resistance display fine-tuning, enabling precise adjustment for both small and large resistance measurements, improving test accuracy and reliability. 3. Adaptive visual experience: 1-9 levels of backlight brightness adjustment; users can set screen brightness to the most comfortable level under various lighting conditions, protecting eyesight and enhancing ease of use. Note: Do not test AC power or voltages exceeding 45V. Working voltage: DC 5V (do not exceed rated voltage) 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: Supports recording of 5 groups of internal resistance measurement data Voltage display fine-tuning: Supported Internal resistance display fine-tuning: Supported Auto shutdown: Supports 1–9 minutes standby time adjustment Backlight brightness: Supports 1–9 levels of display backlight brightness adjustment Please verify the specifications to ensure the item meets your requirements Product may vary slightly due to batch differences; minor color or design variations may occur but do not affect functionality Color: Black Material: Plastic Specifications: A: Meter + 4P cable Package Contents: 1 x Host with cable (cable color random, no color selection available) Package includes only the items listed above; other items not included Note: Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowed: ±1–3 cm