VLF means Really Reduced Frequency and is identical technological innovation used in detectors created for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Here's 5 reasons why you might choose a VLF in excess of a PI The dilemma https://www.d-ushop.com/forum/topic/84956/metal-detector-techniques-that-really-work