The MTM volume flow meter is a turbine gas meter for the custody transfer of natural gas under MID EN 12261 (2007) and OIML R137 1&2 (2012). The essential parts of the meter defining the metrological performance of the meter are manufactured on the best available multi-axis machines either from high strength, hard anodized aluminum alloys (turbine wheel, gear box, outlet diffusors, etc.), precision injected reinforced engineered plastic materials or from corrosion resistant stainless steels alloys (shafts, bearings, magnetic coupling, etc.). The mechanical design of the meter is dimensioned in so strong that the meters is able to more than fulfill all normative requirements and more. The measuring cartridge of the MTM turbine meter is exchangeable for different pressure housing designs. It can be calibrated in each diameter size to the different G-ratings. Operating pressures up to 100 bar and a volume flow rates of 5 m3/h up to 6500 m3/h depending on the different meter sizes at operating conditions are possible.