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On my Pro the the wheaties and IH's come up as 80 sometimes as high as 82 the newer pennies as 75-78 , dimes come in 83-88 , I did notice that since garrett serviced my machine and upgraded my software that my readings changed drastically,so I am on the learning curve again. I got my pro about 6 mo after they came out, The soil conditions and the angle & depth of cousre has alot to do with it also. the 1923 wheatie I just found came in all screwy but I kept getting a high sweet tone in the 80's once in awhile so I dug it was at 7 + inches HH