Using a scale without a level base is problematic because while you can always set the scale to match an inclinometer determined setting, when you turn the rocker on the base, the scale reading will be off immediately and will not be exactly accurate until you return it to the same azimuth you set it at.

Now, depending in the degree of deviation from level, this error could be small, but it could also be very large and make finding things in a one degree or so field of view very difficult.

The inclinometer takes away the possibility of this error, and so makes it the choice for me. The analog inclinometer mentioned in this thread is about $10, a cheap efficient solution.

Of course leveling the scope is another option, and actually, I do both to make things as accurate as possible.

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Rod Nabholz (Quote)

I've been told that the inclinometer reads true angle of the tube, regardless of the base angle. It certainly doesn't hurt to level the base, but I never have, & have very good results.

Carol