My PT2X or CT2X measures pressure in PSI. How can I change this to feet of water or other units?

In Aqua4Plus, click on the Options menu and then select Display Units. In Aqua4Plus Lite, click on the Configure menu, select Program Configuration, and then select Set Computer Display Units. Use this to select the units in which to display your data. This will control how data is represented on the Real Time Monitor, the File Display Window, the Graph Window, and for exported data.