Klein Tools RT110 Receptacle Tester Detects The Most Common Wiring Problems In Standard Receptacles. Conditions Indicated: Wiring Correct, Open Ground, Reverse Electrical Outlet, Open Hot, Open Neutral, Hot/Ground Reversed. Conditions Not Indicated: Quality Of Ground, Multiple Hot Wires, Combinations Of Defects, Reversal Of Grounded and Grounding Conductors.