finding bigger-size targets with that bigger-size coil. That's what larger search coils are generally good for. I do plan to work mine in a few sites in the next three to four days to check other potentials they have, but ....
Larger coils in this size range are not going to work well in trashier conditions due to too much target masking from the size of the larger EMF of the larger coil. We know some folks use ±15" coils to try and find older, deeper coins in older parks You can do that with this big Nokta/Makro coil, but as a rule, coils of this size usually attain coin depths comparable with an 8" coil, and might even get a very slight increase on larger-size coins, but lose a little responsiveness on the smallest-size coins.
The Nail Board Performance Test? Haven't tried this coil, don't expect it to work well on this test scenario, but I'll check it out later today. Do some other tests today and tomorrow, then respond back.
Monte