Voltage tester for slotted screws: Single-pole phase tester for determining voltages between 110 and 250 V according to DIN VDE 0680-6 on electrical conductors. Blade made of special spring steel alloy, hard-wearing and durable when used as a screwdriver. Insulated blade, ensures safety when working. Cast-on clip, easy to attach. Integrated glow lamp, visual voltage control.