With every electrical system, safety precautions and operational functions are two of the most important requirements to prevent hazards to persons, systems and buildings. The new battery powered DIN VDE 0100 tester, the Testboy TV 456, is a professional and convenient installation tester with a large 3.5 TFT color display and rotary switch. While developing the device tester the quality, functionality and usage comfort were observed as usual, according to the corporate motto From the practice. The Testboy TV 456 offers different performance features to the user, which can be selected according to the need. This all-in-one tester comes in a multi-functional way with modern features and interfaces.This text is machine translated.