The Snap On Tools CT4G Clear Circuit Tester is a high-quality electrical probe designed for diagnosing electrical systems in both passenger vehicles and heavy-duty commercial vehicles. Made in the USA, this 12-volt tester features an analog display and a durable 8" probe for easy and accurate testing. With the trusted Snap On brand and reliable performance, this diagnostic tool is a essential accessory for automotive professionals and mechanics looking to efficiently and effectively detect circuit issues.