VLF stands for Pretty Minimal Frequency and is the same technological know-how Utilized in detectors built for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Here's 5 explanation why you may perhaps decide on a VLF above a PI https://kisanlink.com/forums/discussion/dairy-cows-cattle/long-distance-detection-with-a-metal-detector