The professional III LED is an innovative two-pole voltage tester with a wide range of services from the house of testboy. The Testboy Profi III LED impresses with its user-friendly handling as well as the robust and reliable design and simplifies installation and service technicians day-to-day work. An automatic switch-off device prevents the fast draining the batteries. At a voltage of 35 V AC/DC a visual, acoustic and vibrating alert for signalling a life-threatening voltage. The load that can be switched on via button enables the deliberate triggering of the FI-switch, so that the protective conductor can be measured.This text is machine translated.