VLF means Extremely Small Frequency and is similar technologies Employed in detectors constructed for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here i will discuss five main reasons why you could possibly select a VLF above a PI https://www.bonback.com/forum/topic/279153/how-to-use-a-metal-detector-in-any-terrain