Ambient temperature is an important factor. Temperature changes may cause deformation of the elastic elements inside the pressure gauge, thus affecting the accuracy of pressure measurement. Humidity may also cause corrosion to some parts of the pressure gauge and then affect its performance. In addition, the accuracy and stability of the standard pressure source during the calibration process have a direct impact on the calibration results. If the standard pressure source itself has errors or fluctuations, the calibrated pressure gauge data will also be inaccurate. The skills and operation standardization of the operator cannot be ignored either. Inexperienced operation may lead to problems such as loose connections and inaccurate readings, thus reducing the accuracy of calibration.