On Tue, Mar 01, 2022 at 01:11:52PM +0100, Tim Ziemer wrote:

> Errors of more than one degree are very common.

Where do you get that ? Just look up some specs. Even a cheap
(20 Euro) plastic bubble level can have a sensitivity [1] of
1/2000 (0.03 degrees).

Absolute accuracy is easy to check, just turn the level by
180 degrees.

Those used by e.g. surveyors (still analog 'bubble') can be
orders of magnitude better.

Most people have absolutely no idea of how accurate old-school
analog things can be. Manufacturing and use of some of those 
is based on hundreds of years of experience. 

[1] Sensitivity is the inclination required to move the bubble
by one graduation line. Graduation lines are typically 2 mm
apart.

Ciao,

-- 
FA

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