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 to 1000 VAC non-contact voltage tester on the other the dualcheck quickly provides an accurate analysis of any 120 V receptacle. The non-contact voltage tester detects 50 to 1000 VAC 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 features a clear and easy-to understand single led readout indicating correct wiring or open ground, open neutral, hot/gnd reverse, hot/neu reverse and open hot wiring errors without the nee