VLF stands for Very Very low Frequency and is similar engineering used in detectors built for cash, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from three kHz to 70 kHz. Here i will discuss five explanations why you would possibly opt for a VLF more http://leydis16.phorum.pl/viewtopic.php?p=1026025#1026025