This was mentioned on the Vision forum to test recovery speed, place 3 quarters 3 inch's apart and see if you get 3 seperate tones on a fast sweep..They said very few detectors can do this...I actually placed the quarters touching each other (no distance between them) and the Etrac gave me 3 seperate tones...A poster on there said no detector can do this??....Can one of you run this test also for a second opinion