To whom it may concern, I just bought a house that was built in 1958. When the house inspector went through the house, he noted that our main fuse box was grounded at the breaker, and then randomly tested various plugs throughout the house and they were grounded. GCFI plugs were installed in the bathroom, kitchen and garage areas respectively. Unfortunately renters were in the process of moving out and furniture was blocking maybe five or six outlets. When the furniture was moved and we finally took possession, we noted around 5 outlets were two pronged. I was planning to test for ground using a voltage tester, by plugging the leads into the polarized plugs (following directions for which color goes where) and then move the lead from the small plug to the screw on the outlet and if the voltage doesn't change then it's grounded. I don't have much money and can't afford to rewire the house. Regardless of how the plugs come back, I'm planning on replacing the receptacles with GCFI outlets. Is there anything else I should do, that won't cost me too much? I don't plan on plugging a TV or computer into the GCFI receptacles, just fans, a phone charger and clock radio because it's in the bedroom.