Parameter information: the package includes 4 pieces of car voltmeters, the input voltage is 12-24V, the measuring range is DC 5-32V and the accuracy is 0.1V, suitable dimensions are available for your daily use Clear LED indicator: with the precise 3-bit LED digital display, 12V voltmeter is easy to read. It is a real-time monitor of battery voltage that allows you to detect the electrical size status in time and capture the battery voltage status between fully charged and discharged DC voltmeter Reliable to use: the LED display meter is made of flame-retardant, waterproof and durable materials, safe and reliable to use, rust and corrosion resistant. With reverse connection protection function, the wire line is not burned and broken, which can help you with long-term application service Easy to use: The automatic waterproof voltmeter is easy and convenient to use. Simply install the voltmeter into a 1-1/8 inch hole in the control panel, which is approx. A 0.25 inch thick nylon