VLF means Extremely Small Frequency and is similar technologies used in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Here's five main reasons why you may perhaps go with a VLF in excess of a PI https://kisanlink.com/forums/discussion/poultry-discussion/complete-guide-to-choosing-metal-and-gold-detectors