I was detecting my backyard again with the 12X15 coil and got a strong signal of a quarter at 5 inches. I dug to 5 inches and found nothing. I swept the hole again and it signaled a quarter again. Realizing the coil was not going to be accurate on depth I started digging deeper. I then used my Sunray probe and it indicated a quarter 3 more inches deeper; So I dug 3 more inches and hit metal. I had to use a shovel to dig out my quarter which turned out to be a large piece of aluminum. Using the pinpointer on the metal alone the reading was a quarter. realizing the metal was quite large I understood why the signal was so strong. I measured the depth and it was 13 inches deep. This coil not only sees deep but separates targets very well because there was a long piece of what looks like it was from a hanger at about 7 inches to the side of the hole. I have aluminum ring up as a coin depending on how large it is from time to time but this signal really fooled me.
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Sounds really good till you get to the depth that it's suppose to be, and it ain't. 
Then you start wondering what could it possibly be? 
Curiosity usually gets the best of ya and you just gotta dig it and take a peek. 
