VLF stands for Really Reduced Frequency and is similar engineering Utilized in detectors designed for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from 3 kHz to 70 kHz. Allow me to share 5 explanation why you could opt for a VLF around a PI http://classichonda.phorum.pl/viewtopic.php?p=173497#173497