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Replies
Mohammad,
the two dots are at the same height when the instrument is good levelled.
Otherwise, the rotation axis of the telescope can't be horizontal and both horizontal and vertical angle will be wrong.
The slightly (I hope ...) differences You found are related to the difficult of measuring the vertical height with a meter tape.
The better way is using the GHT196 holder with GHM007 tape meter. Is expensive, but very precise.
Bye
Carlo Alberto
Yeah, but every of them give the deference height, I think one of them should be the correct one.