In my yard, it reads about 24 in auto. At the mineralised site, it can dip into the single digits. That's why I have had to switch to manual. I find on torn up roads (and torn up sidewalks, I presume), The sensitivity drops dramatically and probably needs to, in order to compensate for that situation. I think this machine is more versatile and has found some shallower coins in tougher situations. But I need some depth for the old silver??? Still working it though!