VLF stands for Very Very low Frequency and is identical technological know-how Utilized in detectors created for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Listed here are five main reasons why you could possibly pick a VLF about https://ava.ifsul.edu.br/reitoria/mod/forum/discuss.php?d=38239