They are primarily used:

In the public gas supply network

In gas transfer and metering stations.
For the measurement of gas consumption and distribution in municipal and gas provider facilities, as well as the gas consumed by end users, e.g. steelworks, tile and glass making plants, as well as schools, hospitals, apartment complexes etc.

In the chemical industry

For metering gas consumption, gas distribution, also for process gas flow control.

In the car industry

For measuring the inlet air flow of combustion engines on test and research benches.

In industry

For measuring the consumption of compressed air.

In compressor technology

For determining the air volume generated on test benches.