What it does Designed to test the 12V battery voltage or the voltage of the charging system, helping you quickly diagnose charging problems and confirm system performance. Key features LED display with clear voltage reading and an LED battery status indicator for ataglance assessment. Durable rubber housing combined with insulated alligator clips for secure, reliable connections in tight spaces. Builtin safety functions include a reverse connection report and overvoltage protection to prevent damage to the battery and electrical system. Specifications and compatibility Tested voltage range: 12V battery voltage and charging system voltage. Display: LED display with LED battery status indicator. Construction: Rubber body with alligator clip connections. Safety: Reverse connection report; overvoltage protection function. Practical applications Vehicle maintenance: Quickly verify car battery voltage and alternator output during routine service or troubleshooting. Marine and motorcycle setups: Check 12V battery health and charging system in boats, motorcycles, or other 12V installations. Charging verification: Confirm charger output to ensure proper charging voltage and prevent under or overcharging.