1. Adopt volumetric rotary piston principle of measurement. 2. Vacuum sealed register to keep a clear presentation in long-term service. 3. Small start-up flow rate, high precision. 4. Materials comply with hygienic standard of potable water. 5. Stainless steel body with a nice look and high sturdiness. 6. Using of high quality materials to ensure a stable characteristic and long life. Resistance to exterior magnet interference. 7. Hot water meter and remote reading transmission system for option.