Sealey AK4008 Circuit Tester

The Sealey AK4008 Circuit Tester is a compact diagnostic tool designed for testing DC electrical circuits in automotive and light vehicle applications. This traditional brass-bodied tester provides reliable voltage detection across 6-24V DC systems, making it suitable for standard automotive electrical work, motorcycle maintenance, and light commercial vehicle diagnostics. Built with a knurled brass body for durability and grip, the circuit tester features an integrated test light that illuminates when voltage is present, providing instant visual confirmation of live circuits. The probe tip is protected by a brass screw cap when not in use, helping to prevent damage and maintain accuracy over time. The tester is supplied complete with an earth cable and alligator clip for secure connection to vehicle chassis or battery negative terminals, allowing hands-free testing of circuits and components. Its lightweight construction at just 60 grams makes it ideal for mobile mechanics and roadside diagnostics where portability matters.