The Profi III LED is an innovative two-pole voltage tester with a wide range of capabilities from Testboy. The Testboy Profi III LED impresses with its user-friendly handling as well as its robust and safe design, making daily tasks easier for installation and service technicians. An automatic shut-off feature prevents the batteries from draining quickly. At a voltage of 35 V AC/DC, an optical, acoustic, and vibrating warning signals the presence of a life-threatening voltage. The switchable load via a button allows for the intentional triggering of the RCD, enabling the measurement of the protective conductor as well.