How to Test an Outlet: The 5-Minute Check (and the 5 Faults a Tester Can't See) (2026)
A plug-in outlet tester costs about twenty dollars and answers one question in three seconds: is this receptacle wired the way it should be? That is a real answer, and it is also where most people stop. The green light gets treated like a certificate of health, when it is closer to a smoke alarm that only detects one kind of smoke.