VLF means Really Reduced Frequency and is similar engineering Employed in detectors created for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here's five explanation why you could go with a VLF over a PI Our writers and editors https://forum.programosy.pl/gold-detector-finds-that-made-history-vt356068.html