Electrical Outlet Tester and Voltage Detector Pen Set - Test your Home for a Live Wire AC Volt Current on a Receptacle GFCI Socket for Polarity OUTLET AND TIC TRACER BUNDLE - Perfect for the Professional and Homeowner Alike ELECTRICIAN APPROVED - Troubleshoot why a socket or sockets might not be working in your house TRACE WIRES - Safe for locating and measuring low and high amperage. Sensitivity Range 90 - 1000 VAC BUILT-IN FLASHLIGHT - Illuminate dim areas to make work easier INDISPENSABLE TOOL! Absolutely essential for electrical, remodeling, and/or home improvement projects!