Raw pressure data

I am trying to develop an app that uses the pressure information from Sensor.Info.pressure. When i test my app on the Fenix 3 i do not get the result i want. When i apply a sudden pressure change the readings do change but after a few seconds the value moves back the the value before i increased the pressure. It looks to me that this is not a raw sensor value but some auto calibrated one. Is there a way to use the raw sensor data?