Automatic Tank Gauge (ATG) An electronic device that measures liquid level and calculates liquid volume in an underground storage tank. By rhys|2014-10-07T18:56:47+00:00October 7th, 2014|Comments Off on Automatic Tank Gauge (ATG) Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys