VLF means Very Minimal Frequency and is similar technological innovation Utilized in detectors developed for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Here's five explanation why you may go with a VLF around a PI a golden ring https://www.cemkrete.com/forum/topic/118901/metal-detector-tips-for-beginners%E2%80%99-adventures