VLF means Extremely Lower Frequency and is the same know-how used in detectors constructed for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Here's five explanations why you would possibly choose a VLF above a PI In addition to https://divekeeper.com/forums/discussion/technical-diving/gold-detector-thrills-and-spills