VLF means Very Lower Frequency and is identical technologies Employed in detectors created for coins, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from 3 kHz to 70 kHz. Listed here are 5 explanations why you would possibly opt for a VLF around a PI Right http://taniecirlandzki.phorum.pl/viewtopic.php?p=119213#119213