VLF stands for Incredibly Minimal Frequency and is the same technological innovation used in detectors designed for coins, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Here's 5 reasons why you could possibly decide on a VLF about a PI https://www.fw-follow.com/forum/topic/78582/gold-detector-tales-of-desert-treasures