VLF stands for Really Minimal Frequency and is the same technologies Utilized in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Here are 5 reasons why you may select a VLF in excess of a PI http://family.bigbrother.bg/forum/topic_show.pl?tid=238943;msg=NewPost;sid=7de5b3574a1f2bf1789ea8d6e3506a1c