VLF means Pretty Minimal Frequency and is identical technologies Employed in detectors crafted for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Allow me to share five main reasons why you would possibly choose a VLF about a PI https://ava.ifsul.edu.br/reitoria/mod/forum/discuss.php?d=38254