Gardner Bender GTK-2 Safety Kit, GVD-3504 Non-Contact Voltage Tester and GFI-3501 GFI Tester, 2-Piece Non-Contact Voltage Tester senses AC voltage from 50-600V Non-Contact Voltage Tester features visual and audible indicator, pocket clip, on-off button GFCI Outlet Tester features indicating lamps that indicate 5 common wiring errors GFCI Outlet Tester has comfortable contoured design Two Piece Safety Kit Superior quality at an affordable price Gardner Bender branded products and professional equipment have been a mainstay with electrical contractors