VLF stands for Really Small Frequency and is the same technology Employed in detectors built for cash, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Listed here are 5 explanation why you could select a VLF in excess of a https://ava.ifsul.edu.br/reitoria/mod/forum/discuss.php?d=38239