VLF stands for Incredibly Reduced Frequency and is identical technologies Utilized in detectors designed for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Here are 5 explanations why you would possibly opt for a VLF more than a PI https://linuxline.org/blogs/125296/Accuracy-of-Modern-Metal-and-Gold-Detectors