Large size parts generally refer to those parts with more than one meter long in each dimension, such as low-pressure cylinder of steam turbine, wing panel of plane and so on.

During thermal recovery, to get full parameters as to guide production needs a test meter which could be used under high temperature, high pressure, and steam water biphase conditions.

The normal pressure meter is suite measure some liquate, gas, steam medium pressure which has no corruption for copper and steel.