Wife and I both use the 800s and hunt side by side. Was at a rodeo arena and I was getting a very poor signal in tone and numbers but was an iffy high squeek and vdi of 27, 28,29.30. So was telling me possible quarter? Dug down around 15 inches , nothing on pin pointer still. Called wife over to have her check it: Nothing, only iron grunts and vdi of 6,9,3 so on. I went over both detectors to affirm they were set up identical! Park 1, sen 21, speed and iron the same. I changed hers to park 2 and upped the sen to 24 and such to no avail , no matter what, hers couldnt see what ended up being a quarter on edge in the side of my hole about 9 inches down. So it has me convinced that one detector may be more sensitive then the next. Has any one compared two equinox 800s on same targets in the ground ? It doesnt really seem to matter caz she beats me on best finds 8 out of 10 times anyways!