3-Prong AC Outlet Plug Receptacle Tester - Ground Fault Circuit Analyzer for Home & Office Electrical Safety Testing

These are great and at $6 approximately the price is right, but if you plan on using it a lot get a few to have spares. I use mine in home inspection so they are shoved into maybe 50 - 100 outlets in one house! All of that in and out will eventually make it start to come apart and fail. But so does a Klein tester, so take it as a device that will require periodic replacement of used a lot. I’ll buy them again!