text: Heed the #3 (above) warning about not allowing them to snap together! YES....THEY WILL BREAK! And mine did. I guess there are different number ratings. The one I just lost had no rating, but it would almost leap to metallic items. This one does not. However, I mostly need it for finding wall studs, and these do work marginally. The delivery photo also shows it and other packages laying on our wet grass! It's been raining!