Ultrasound. Commercial thickness gauges for steel cover a few inches. Don't know about ice. Some experts can tell from sledge hammer thump on top. On Wed, Nov 6, 2013 at 6:06 PM, BOB wrote: > I have a friend who is a die hard ice fisherman. He was wondering if > there is a way to measure the thickness of ice on a lake with out > drilling a hole in it. > > Anyone know of some type of sensor that would do this? > > Bob > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=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 .