Aluminum can give me fits at times. It's something we all have to deal with. I found one of the best finds in a while the other day with the MXT. A confederate cast I button That read in the 24 to 26 range. It was shallow and I would have swore it was a piece of aluminum. Now I'm digging a lot of aluminum for fear of missing another good button. I've had detectors that I felt I could tell the difference by the sound but now I sure Ive walked over some good stuff before. Any ideas on how deal with this? I'm listening. But I'm also thinking the shovel is the answer.