I thought I would pick up a metal detector to find metal in logs/trees before sawing. I was even thinking that a little hand held stud finder might do the trick. Now I'm kinda thinking that this might be far more complicated than I first thought. It seems like there is no way to measure how powerful these things are. A studfinder can be good at finding nails in studs if you already know where the nail is! But to scan a tree could take a loooong time because you aren't sure if there is a nail in there or not. A more powerful detector might work faster - but how do you tell which ones are more powerful?