Engineered to specifications required by professional electricians the innovative 2-in-1 DualCheck Tester from Sperry Instruments saves you time and money, while providing quality you can trust. This patent-pending dual-ended tester incorporates 2 of the most popular testers used by electricians, inspectors, technicians and homeowners into a single unit. Engineered with an exclusive design and latest technology GFCI Outlet Tester on one end and a 50-1000V AC Non-Contact Voltage Tester on the other the DualCheck quickly provides an accurate analysis of any 120 volt receptacle. The Non-Contact Voltage Tester detects 50-1000V AC and features a bright 360 deg LED visual indicator along with an audible beeping indicator of the presence of voltage. On the other end our best-in-class GFCI Outlet Tester's advanced circuitry and proprietary design precisely detects the required low resistance values (less than 10ohms) on ground wire INSTANTLY and features a clear and easy-to understand single L