VLF stands for Really Minimal Frequency and is identical engineering Employed in detectors constructed for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here i will discuss five reasons why you may go with a VLF over a PI http://hotel-golebiewski.phorum.pl/viewtopic.php?p=882228#882228