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I would assume one would use good small spirit level on the tube to make it level, then press the zero button.
I then also would imagine if you notice your pointing was always a little low or high, you could re-zero the tube when it was pointing slighty low or high, whatever was needed.
Does anyone know if they remember calibration settings? Or if they turn off automatically after a few minutes?
It would be quite frustrating to have to re-calibrate everytime it turned itself off through the night.
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