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Oh, I didn't register that you had a Dremel. There's a nice one here on Amazon for about $38. I need to look around at other places (like Harbor Freight) before I pull the trigger on that one,...

The first pic below is what I'm talking about. If you want to add one to your drill motor, you have to be sure it's "calibrated" before you glue it on.
The second picture is a thing I got at Sears...

One of my drill motors has a round bubble level on the back. Makes it easy to see when you're perpendicular. Of course, the scales need to be still flat and on a level work surface.
If you put...