VLF means Pretty Very low Frequency and is identical technologies used in detectors developed 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 possibly opt for a VLF above https://www.driedsquidathome.com/forum/topic/99006/metal-detector-ground-balance-explained