I had an opportunity to take the Smart Pro Plus Series to an area to hunt that I take all my new machines to see if they will live up to the claims. This area is hard to find anything because I use little to virtually no discrimination when I hunt. The Pro did find these 2 targets, (pin rusted off on the back of snake and shank intact on the flat button) simply because they were deep. On the Pro,the more you decrease the discrimination, the deeper it goes and both these target were at the preset on the discrimination which seems to be the "sweet spot." For old colonial and 1900s homes and CW sites, this machine will be hard to beat. HH Richard