This handy standard receptacle tester features a compact comfortable contoured design with neon indicators that display positive indication of circuit status. Compact unit simply plugs into any standard 3-wire/grounded receptacle (110-125 V AC circuits) and a succession of yellow and red lights provides indication of circuit status or specifies wiring errors. Lamps reveal 5 common wiring errors including: open ground open neutral open hot hot/ground reverse hot/neutral reverse as well as correct wiring. Easy to read status chart displayed on both top and bottom of the tester for multiple position viewing. Designed for use on standard outlets and extension cords. ETL approved unit also offers a one year warranty