Metal Detectors Feb 22, 2009 8:44:03 GMT -8 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Deleted on Feb 22, 2009 8:44:03 GMT -8 Here is an excellent primer on understanding VLF and PI type metal detectors. A little technical but well worth the read.Enjoy......, Ron.nevada-outback-gems.com/design_plans/DIY_metal_detect/metal_detector.htm