I accidentally broke my old magnetic stud sensor which I always use in conjunction with an electronic type. I went down to the local True Value and picked up a new one made by C.H. Hanson which uses the rare earth/neodymium magnets. I like this one as it has a small bubble level built in which can be rotated 90 or 180 degrees.
The magnets are really strong, no problem at all zeroing in on nail heads in drywall and sticking right to them on the wall surface. But what surprised me was setting it down on a granite countertop in the kitchen and bathroom the magnets were attracted to the granite. Not as strong as sticking it to the side of a refrigerator for example but definitely magnetic across the entire surface of the countertops which are set down on plywood tops of the cabinet structures. Odd....
The magnets are really strong, no problem at all zeroing in on nail heads in drywall and sticking right to them on the wall surface. But what surprised me was setting it down on a granite countertop in the kitchen and bathroom the magnets were attracted to the granite. Not as strong as sticking it to the side of a refrigerator for example but definitely magnetic across the entire surface of the countertops which are set down on plywood tops of the cabinet structures. Odd....