The CT20 is a versatile electronic tool designed specifically for electricians, alarm technicians, cable installers and other professionals who regularly need to test circuit continuity or identify cables and wires. With this device, a single person can quickly and accurately locate and mark two wires, even if the cable ends are in different rooms. The CT20 is suitable for cables with a length of up to 3,000 meters and a minimum thickness of AWG 26. In the "external continuity test" mode, the device not only enables continuity testing, but also the simultaneous identification of two or more cables.