Xuner Instruments will give you the answer:
Generally speaking, Roots flowmeters have high accuracy, and the basic error is generally ±0.5r, and special ones can reach ±0.2r or more. high. Usually used in expensive media or where accurate flow meters are required. Turbine flow meters have different accuracies depending on the size of the meter. However, the selection depends on the actual situation of the user. Generally, users with relatively stable gas consumption or natural gas users will choose turbine meters, which are easier to repair and replace than Roots meters. For details, see: sure-meter.com