The Snap On Tools Auto Test Light Voltage Tester is a high-quality diagnostic tool designed for testing both 6-volt and 12-volt vehicle systems. This unit comes with probes as accessories and is suitable for a variety of vehicle types including motorcycles, ATVs, passenger vehicles, and heavy-duty/commercial vehicles. With the Snap On brand known for its reliability and durability, this voltage tester is a must-have for automotive technicians and enthusiasts looking to accurately diagnose electrical issues with their vehicles.