Tests standard receptacles to ensure proper wiring. Neon indicators give positive indication of circuit status. Compact unit simply plugs into any standard 3-wire/grounded receptacle (110 - 125 VAC circuits). Tests for six circuit conditions: open ground, open neutral, open hot, hot/ground reverse, hot/neutral reverse, and correct wiring. Succession of yellow and red lights provides indication of circuit status or specifies wiring errors. Three easy-to-read views – top, side and bottom. TESTS: Standard outlets, Extension cords