VLF means Really Minimal Frequency and is the same technology Employed in detectors created for coins, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here are 5 explanations why you would possibly pick a VLF in excess of a PI https://healingxchange.ning.com/forum/topics/metal-detector-success-stories-around-the-world