You might want to start with the sensitivity very low, 10 or less, listen closely to the tones.. You can set it to reject everything except what you are looking for, don't recomend this for a hunt but practise, to learn the sound..Try to start in an area that is not too trashy.. Don't give up on it.. Very sensitive piece of eqip that looks deep..I dug a rusty oxidized bolt at 20"s yesterday, another detector could not see..I have a hard time seperating folded aluminum, and very old oxidized steel, from the coins and still dig some of these, just part of the game..Generally these targets will not give steady repeatable number or tone, if these want to hop around it is probably trash.. I have found this machine very reliable on a solid number and tone. Probably this machine is a little harder to learn than some, but hang in there, it teaches me something on every outing..I have thought at times its ability to detect is advanced past its ability to decern, just my idea..dl il