VLF stands for Incredibly Reduced Frequency and is identical technological know-how Employed in detectors created for coins, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Here are five explanations why you could possibly go with a VLF over a PI https://168.exodirectory.com/index.php?topic=267773.new#new