Compass metal detector

This is an air test that I did on my 30 year old Compass metal detector. The sound was not actually captured as well as I wanted, but I was able to hear the detection signal far better than my camera was able to so hence the location where I placed the coins were based on that. I was surprised to see that this old detector which I've really only had for a month was able to detect a copper penny at about 12 inches, though I was using a 12 inch coil and ear phones to help me do so. I actually plan to use this detector for nugget shooting.