Pentax ETH-302 Instruction Manual page 38

2/5/10/20 sec. angle accuracy detachable tribrach
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Adjustment
Center the plate vial bubble.
1
Rotate the instrument 180°, move the bubble half way back to
2
the center by operating a leveling screw which is located parallel
with the plate vial.
Rotate the vial adjusting screw with the adjusting pin and position
3
the bubble in the center.
Repeat procedure again to confirm.
4
38

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Eth-305Eth-310Eth-320

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