When taking inventory, instead of using the + and - buttons, you can add or remove full units of a called up item by using swipe gestures.
Note: This only adds full units, not cases.
Add 1 Full Unit
Swipe up to add 1 full unit to the count
Remove 1 Full Unit
Swipe down to remove 1 full unit from the count
Add 6 Full Units
Swipe right to add 6 full units to the count
Add 24 Full Units
Swipe left to add 24 full units to the count