Howdy Guys
I've noticed the same phenomenon {yes,i had to look this word up} useing different metered {analog&digital} detectors. After many years and thousands of hours listening to the audio of various targets at depth, I rely on the target audio first,and look at the meter only for gigles and grins. Meters are fun,but don't trust them,you could be walking past a great find. Like the time I was at an old house yard,I was running my old Toltec ll and got this signal that sounded sweet. I looked at the meter and it read iron-foil on it's analog dial,it sounded good so I dug it up. It turned out to be a nice V nickle. It didn't read nickle till it was out of the hole.
Another time I was in a different old yard,useing the same detector,I got this faint,almost whisper of a signal,if a truck had driven by I would have never heard it kind of signal.I knew from the sound it was a good target. Looking at the analog meter,the Toltec ll said it was screwcap, but I knew different. I turned on the all metal switch and it's signal was'nt all that strong, then I looked at the depth reading on the dial and it was reading 7 plus inches. I smiled to myself, thinking that this just maybe a seated dime. So I hit the ground,pulled a 4 inch plug, and run the detector back over the hole. The meter was reading upscale now and the signal was much louder. It turned out to be a nice condition seated liberty dime, it was dated 1876, Philladelphia mint, a common coin. But it was treasure to me. I won't comment on the depth of coin, but it's depth was impressive.HH.............Hombre