This Mac Tools 6/12 Volt Circuit Tester ET-125D is a top-of-the-line tool that will help you efficiently diagnose electrical issues in your vehicle. With its stainless steel tip, it is durable and will last you a long time. The continuity testing feature makes it easy to check if the circuit is complete or not, and the 12-volt capability ensures that it is compatible with most vehicles. The brand name Mac Tools is synonymous with quality and reliability, and this circuit tester is no exception. Its manufacturer part number is ET125D, and it comes with probes as an accessory. Whether you are a professional mechanic or a DIY enthusiast, this circuit tester is an essential tool that you need to have in your collection.