The Sealey AK407 Circuit Tester is a versatile diagnostic tool designed for testing DC electrical circuits across a range of voltages. This compact tester is ideal for automotive technicians, auto electricians, and mobile mechanics working on vehicle electrical systems where accurate voltage and polarity identification is essential. Suitable for 6V, 12V, 24V and 48V DC circuits, the AK407 provides reliable circuit testing across passenger vehicles, commercial vehicles, and plant machinery. The integrated LED array clearly indicates both polarity and voltage range, eliminating guesswork during diagnostic work and helping to prevent incorrect connections that could damage vehicle electronics. Supplied complete with an 850mm cable and crocodile earth clamp, this circuit tester offers sufficient reach for testing across engine bays and vehicle interiors. The lightweight design at just 0.03kg makes it highly portable and convenient for mobile technicians or inclusion in automotive tool kits