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I will use my case to explain about the inclinometer.
I have a scope with a wedge as an option. With the wedge, I have an equatorial scope. Without it, my scope is Alt-Az mounted, and useless for long exposure imaging.
When the wedge is mounted, the tilt (or incline) of the mounting face needs to be set to 90 degrees, less my latitude. My latitude is 33.3 degrees south, so, the mount face needs to be set at 56.7 degrees (90 - 33.3), in order to be pointing straight at the south celestial pole.
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