VLF means Incredibly Reduced Frequency and is similar technological innovation used in detectors built for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Here i will discuss 5 reasons why you would possibly go with a VLF above a https://archives.profsurv.com/forum/Professional-Surveyor-Magazine-Discussion/Education/-151484.aspx