The Faithfull Mainstester Screwdriver is a compact voltage tester designed for safe and reliable mains circuit testing. Constructed from virtually unbreakable and shatterproof ABS, this essential electrical testing tool features comprehensive insulation on the handle, pocket clip and blade for maximum user safety during operation. Manufactured to VDE specification 0680-Part 6-4.77, this mains tester provides quick visual confirmation of live circuits through its neon indicator window. To test a circuit, simply place the blade end on the electrical contact and press your thumb against the metal contact next to the viewing window – the neon bulb illuminates when the contact is live. Ideal for electricians and contractors who need to verify circuit status before commencing work, this voltage tester includes a convenient pocket clip for easy access. The 57mm blade length provides suitable reach for standard electrical testing applications whilst maintaining a compact profile for everyday carry. Always verify the neon bulb is functioning correctly by testing on a known live circuit before use. Never touch the uninsulated part of the blade when testing. Specifications: Blade Length (mm): 57 Size: Blade length 57mm (2.1/4 in)