VLF stands for Very Very low Frequency and is similar engineering used in detectors crafted for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Here's 5 main reasons why you could select a VLF about a PI Being an http://nec.phorum.pl/viewtopic.php?p=753912#753912