Be careful with that thing. I would only recommend it to an electrician or someone who knows about electrical installations. The first socket I tested ran without any problems and showed us a voltage drop of about 10% with the old wiring. It was a notoriously good outlet with a construction site. The next socket I tested was recently replaced by our landlord and I wanted to check if the floor is okay. Well, at first the tool worked fine, but when I was doing a ground resistance test I got a nasty electric shock while holding the tool in my left hand. Test, can cause the chassis to become electrified by anything connected to the circuit. In this case the result was a severe shock due to our outdated wiring with armored wire used as ground. I understand that for certain tests the device generates a load of 15A, which at 120V would be 1800W. Unless you already know that your wiring is good (well grounded), you must be very careful when using the ground resistance test. which really diminishes the usefulness of this tool! If you purchase this item, please wear insulated gloves when using. I can recommend MaxiFlex Ultimate nitrile gloves for electronics work, but you need thick rubber gloves for real protection. Instead, I might try the Sperry Stop Shock II, which has a "Bad Ground" indicator. Will update this review when this other tool works better. If my bad experience helped you avoid trouble, let me know.
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