1.Vacuum sealed register ensures the dial kept fog and keep reading clear in a long-term service. 2. The counter can be turned discretionally and easy for copy the reading. 3. Wide measuring range and small start-up flow rate 4. ed high quality materials for steady & reliable characteristic and nice look 5. Small in size and light in weight 6. Brass or stainless steel body,hot water meter,magnet-proof device and remote reading transmission system for option Note: Technical data conform to ISO4064