VLF means Extremely Very low Frequency and is the same technologies Utilized in detectors crafted for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Here i will discuss five main reasons why you could go with a VLF above https://divekeeper.com/forums/discussion/technical-diving/high-performance-metal-detector-for-professionals