Apparently, the secret to success with this detector is to dig those signals that jump between mid tone & high tone, besides the solid high tones. I spent several hours with it in a nearby park & schoolyard. Didn't find much & deepest coin 1 1/4". I planted a dime in the backyard down almost 4" & the ID jumped between dime, quarter, zinc & pulltab. I had been following the general rule, jumping=trash. Now I must go back & dig up some of those "trash" signals!
Also in my ground it beeps alot on iron with iron accepted, so one must (if they don't want to hear all that) turn sensitivity down or reject iron. I haven't really tried to investigate if some of those iron signals are good deep objects. HH, George (MN)