I have a friend who is a die hard ice fisherman. He was wondering if=20 there is a way to measure the thickness of ice on a lake with out=20 drilling a hole in it. Anyone know of some type of sensor that would do this? Bob --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .