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(FlukeProducts)
I still can't figure out how the wood detection works, the other two are quite obvious. It works anyway. I haven't seen in any special shop (from where I buy wholesale materials) any such tool of good quality, like a fluke. Only the largest one carries a professional line of multimeters, I don't remember the brand, but an european version of Fluke. I even measure the leakage resistance of a heating element with the megohm scale of a multimeter, and not with a Meger as it's *supposed* to be, FWIW, and usually an earth leakage trips the main GFCI, anyway.