VLF means Incredibly Minimal Frequency and is the same know-how Utilized in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Here's five main reasons why you could select a VLF around a PI The smartest thing http://lkf.phorum.pl/viewtopic.php?p=53152#53152