Professional underground metal detector has function of detecting the presence of metal, 7.0kHz signal frequency, finding underground hidden metal inclusions, light weight, LCD display / alarm...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.bdstall.com/details/professional-underground-metal-detector-with-folding-shove-38885/&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNEK3u7wtYS0DfUZBwsTM7DWWpU_pA
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