I am in contact with RECTA, the Swiss Compass company. They do not have a true 'button compass' , but have a few of the small units similar to the Silva/Suunto/Brunton zipper pull sized units. They explained that even high quality liquid units may develop bubbles. This is due to altitude changes and shouldn't affect accuracy. I gave up on Brunton. If they won't provide an advertised product Ill find other suppliers- for all my needs.