The ANENG Universal Car Relay Tester Voltage Tester RT01 11-25V is a reliable tool for diagnosing automotive electrical systems. This unit, suitable for motorcycles, passenger vehicles, and heavy-duty/commercial vehicles, features a digital display for easy reading of 12-volt systems. Made in the United States, this tester is a versatile accessory for troubleshooting and maintenance tasks. The user guide provides instructions for proper usage, making it a valuable tool for automotive professionals and enthusiasts alike.