My first call was not for anything I expected. A man who has a leek in the plastic tubing of the radiant flooring heat beneath his den floor, that has brass fittings he believed the fittings are leaking. rather then tear up the whole floor he wanted to zero in on the possible areas of the fittings. The wood floor has a wire grid, and some wire under it, so trying to zero in on the correct place was tedious. Shutting off the electric grid, in the house, turning the sensitivity way down seemed to be the trick to find them under the 2″ of flooring. Notched out the Fs. and went to work. after about 1/2 hr. He was pretty sure the problem was in a 15ft. sq. area.We gridded it out and found 3 possible spots that came up as 3 to 5 on the screen, with a solid 4 which I took as the good target for brass. had a good tone as well. The man is going to rip up the floor in those areas first ,next week, and let me know if I was on target or not. Using the new Fisher F11 so I’m asking anyone who is reading this to let me know if you feel I was on the right track, or suggestions for the future. Thanks.