VLF stands for Extremely Lower Frequency and is identical engineering used in detectors constructed for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Listed below are five explanations why you could select a VLF more than a PI a https://www.tapatalk.com/groups/lovinworld/viewtopic.php?f=66&t=14242&from_new_topic=1