What is a barometer supplied with a nonlinear calibration, so as to indicate altitude called?

What is a barometer supplied with a nonlinear calibration, so as to indicate altitude called? Correct Answer Pressure altimeter

Pressure altimeter may also be referred to as barometer’s which are equipped with a nonlinear calibration. Such calibration is done so as to indicate altitude. Further, these instruments may also be called as barometric altimeter.

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