This is not a transit level; It's a theodolite. This is a simple instrument, optical (not electronic), universal, made in China, what you see is what you get, the quality is reasonable. ". Not like that. After carefully and carefully adjusting the bubble level so that the optical axis is parallel to the mounting base, then setting the pointer reticle on the protractor to 0, and locking the pointer in place with the included set screw, I got that found the angle to the horizontal could be measured to within about 0.2 degrees The results I got using tangent calculations agreed surprisingly well with measurements made without using a theodolite.
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