The IDEAL® GFCI Receptacle / Voltage Tester is a versatile 120V AC plug-in outlet tester designed to ensure electrical safety with ease. It indicates proper polarity or mis-wired outlets using green and red LED lights, and displays line voltage via an LCD. This tester also checks GFCI functionality, making it a convenient tool for any electrician. Its standout feature is the low-profile design, perfect for confined and hard-to-reach areas, with indicator lights visible from both the top and front of the unit.