I tried some air testing with the EQ600 this morning on some of my silver and gold rings. Something very interesting happened on a large silver ring as I was testing different orientations. First laying flat solid high TID then on its end when sweeping it horizontally TID was a bit lower but when sweeping vertically NO TID??? Did same test with gold ring 14k 8g flat good TID of 18. Then on end horizontally a TID of 12 and finally vertically a TID of 8-9 with a very low tone in the middle of the coil. I may have missed a few diggable targets because i was thinking pop tab when I heard that type of signal but wont make that assumption again. HMMMM