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Fig. 9
Fig. 10
3. Checking and Adjustment
Please check the instrument before starting your work. The instrument
must be checked and adjusted by a trained person regularly.
3.1 Circular Bubble
• Center the bubble of the circular level
precisely by using the leveling foot
screws.
• Turn the telescope around 180° (fig. 9).
• The bubble needs adjusting if it is not
centered.
• Adjust the leveling foot screws to move
the bubble to the middle place of the
error (fig. 10).