a)Vacuum sealed register ensures the dial kept fog and keep reading clear in long-term service. b)The counter can be turned discretionally and easy for copy the reading. c)Wide measuring range and small start-up flow rate. d) ed high quality materials for steady & reliable characterisitic and good looking. e)Small in size and light in weight. f)Brass or stainless steel body,hot water meter,magnet-proof device and remote reading transmission system for option. NOTE:Technical data conform to ISO4064.