Need Help WIth Outlet Tester

Old 08-21-17, 10:42 PM
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Need Help WIth Outlet Tester

I recently purchased the Sperry Instruments (GFI6302) Receptacle Tester and tested it on a few outlets. I tested it on non-grounded 3 pronged outlets that were used to replace 2 pronged outlets (these outlets are not GFCI.) I know for sure these outlets are not properly grounded however the tester shows that they are wired correctly (and grounded.) How can it be? Am I using the tester incorrectly?
Old 08-21-17, 10:56 PM
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Are they metal boxes with Bx cable?

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