Features: Measures electrical potential (0.001V-45.00V) and internal resistance (0.1mΩ-6.999Ω) with fine resolution using four wire approach for stable diagnostics. Ideal for TS457 multimeter and TS457 voltmeter applications. Provides 1-9 step brightness control for clear readings in all lighting situations, enhancing visibility during electrical measurement tasks. Stores up to 5 sets of resistance data for easy analysis and efficient problem solving in field or laboratory environments. Customizable auto off timer (1-9 minutes) maintains battery capacity while keeping the unit ready for normal use. Includes electrical potential and resistance fine tuning functions for precise measurements, ensuring consistent results in every reading. Specifications: Working potential: DC5V (do not overvoltage power supply) testing principle: conditioning 4-wire approach potential testing extent: 0.001V~45.00V greatest resolution 0.001V Internal resistance measurement extent: 0.1mΩ~6.999Ω greatest resolution 0.1mΩ Data recording: supports recording 5 sets of internal resistance measurement data Component:Plastic Automatic shutdown: supports 1~9 minutes standby time adjustment Backlight brightness: supports 1~9 levels of display backlight brightness adjustment Product size: 79.5x42.1x27.8mm/3.13x1.66x1.09inch Styles:A/B Package Includes: 1 Set Digital Battery Power Resistance Meter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.