Greenlee TK-30GFI GFCI Electrical Kit Kit contains DM-20 digital multi-meter, GT-10GFI polarity cube, and GT-11 non-contact voltage detector Use to troubleshoot 120-Volt AC grounded outlets Use to measure voltage and check 1.5-Volt and 9-Volt batteries Built-in test leads, no loose parts to lose Safe, non-contact voltage detection