VLF means Quite Small Frequency and is identical technology Employed in detectors built for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Allow me to share 5 explanations why you could choose a VLF in excess of a PI https://www.sociomix.com/c/ugc/best-practices-when-using-a-metal-detector/971791767879203