Pressure sensitivity of turbine gas meters is a well observed phenomenon. However, very few published experimental pressure test data on turbine gas meters can be found for study until the last few years. Regulators in many countries either mandate or recommend the calibration of turbine gas meters close to their intended operating pressures in order to minimize measurement error caused by pressure variation. This paper explains the dependency of k-factor on line pressure, and the relationship between operating pressure and the error performance of turbine meters