It does work
I just downloaded this app 10 minutes ago.. and it found exactly what I was looking for. My neighbor and I were looking for our property line stake (which I knew is rebar). I found it right away under the sod when the reading jumped from 50.something to well over a thousand! I tested it on my zippo, my chinese juniper tree metal stake, and beer can, too. Worked as expected. The more ferrous the metal, the higher the reading. Hence, some of the other comments on spoons working sometimes. Example: A silver spoon will have a lower magnetism than will a stainless steel spoon does.
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Metal Detector -FREE-