This is far from a complete list. Once you gain familiarity with this tool you will think of many ways to use it.
Here's a photo of a dial indicator (DI) set up to center a bolt in a 4-jaw chuck. If the bolt is off-center, the DI plunger will move in and out as the chuck rotates. When the bolt is properly centered there will be little or no movement of the plunger and the needle of the DI will move only .001 or less.