The Performance Tool W2981 Heavy Duty Circuit Tester is a reliable tool designed for testing electrical circuits in heavy-duty applications. With a voltage range of 6/12/24 Volts, this circuit tester is versatile and suitable for various automotive electrical systems. Featuring a 3-1/2-inch probe, this tool provides easy access to circuits in tight spaces. Whether you're working on cars, trucks, or other heavy-duty vehicles, this circuit tester is an essential tool for diagnosing electrical issues. Trust in the quality and durability offered by Performance Tool, a reputable brand known for producing reliable automotive tools. The W2981 Circuit Tester is a valuable addition to any toolbox for both professionals and DIY enthusiasts.