This app is used as a metal detector. If this app sense a strong magnetic field from the metal, the length of the blocks drawn on screen is changed. The block faces the direction of the magnetic field. If measured value is over 250uT, the vibrator work.
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=https://play.google.com/store/apps/details%3Fid%3Dcom.wind.metal%26hl%3Den_US&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNFjy4BtnbIm6MRaWH0Lbuv5lq9u9Q
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