Once data entry is completed, tapping the “Calculate" button will update and display the total volume of all three pipe sections as well as the volume of each section.
A tutorial video for data entry and calculation is available here.
Changing the segment-control selection will change between "Metal displacement / Open-Ended Displacement", "Closed-Ended Displacement" and " Inner Volume" calculation.
After changing the segment-control selection, the “Calculate” button (1) should be pressed again to update the results.