Nope, 55 is the magic number. Just kidding I’ve never owned one and that doesn’t matter. It’s different for every site. Turn it up high then reduce it until it’s stable. Reduce it more if you’re looking for shallower targets.
I turn my sensitivity up into the eighties. I will turn it down into the thirties if I am by a large metal object in order to get closer to the object.
I remember reading that a couple numbers actually increase depth a lot more than you would think. If I remember correctly the first number was around 50 and then I think it was into the 90's for the next big increase.
