4 khz and go up to 100 khz . VFLEX technology VFLEX uses state of the art digital electronics and signal processing to enhance conventional single frequency (VLF) metal detector technology. They start at about $400-500 and Very Low Frequency (VLF) detectors are the most versatile and widely used ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://xarxahavaneres.com/1gcd/pxs9e.php%3Fvuz%3Dvlf-metal-detector-frequency&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNHd6F8uYIaXvW60DjSqV7MMl5pIpA
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