The Mac Tools 24v 36v LED Electrical Voltage Circuit Tester Probe ET124D is a high-quality diagnostic tool designed for heavy-duty and commercial vehicles. This product includes a carrying case and clamps for easy use and portability. With the ability to test voltages up to 36 volts, this tester is perfect for troubleshooting electrical circuits in a variety of vehicles. The compact size and LED indicator make it a convenient and reliable tool for automotive professionals and car enthusiasts alike. Made by Mac Tools, a trusted brand in automotive tools, this electrical voltage circuit tester probe is a must-have for any mechanic's toolbox.