Pressure calibration is as important today as it has been for a very long time, but the way calibration is done and the equipment used to do it has changed drastically. In the past, it was a standard practice to use a primary standard for pressure calibration. That standard was normally a deadweight tester or a manometer. Today, with more accurate secondary standards available, there is a larger choice in what can be used for pressure calibration. What is used normally will depend on the requirements that have to be met and the equipment that is available. This paper discusses issues that should be taken into consideration when choosing a pressure calibrator from the many that are available today