Extended data:
There are G 1.6, G2.5, G4 household meters and G6, G 10, G 16, G25, G40, G65, G 100 industrial meters, as well as smart IC card gas meters, code prepaid gas meters and direct reading smart meters.
Comparison of advantages and disadvantages
Roller counter has many advantages, but it has a big disadvantage, that is, it has to overcome the great friction resistance when driving the high-position wheel during handling. The gas meter can overcome this shortcoming because its driving force is relatively large.