VLF means Incredibly Low Frequency and is the same engineering used in detectors designed for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Here are 5 reasons why you would possibly select a VLF in excess of a PI https://forum.programosy.pl/gold-detector-secrets-from-veteran-hunters-vt356069.html