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• Please check the electronic vial in a steady environment that has no vibration or rapid
temperature change.
• When the electronic vial is checked outdoors and on a tripod, avoid sunlight influence by
using a sunshade. Please wait for a while until the instrument and tripod are at the same
temperature as the surrounding air.
• When the instrument is seen at the position of "Left circle", movement and the inclination
of the instrument become the same on the screen in the electronic vial.
Please note that the movement of the bubble becomes opposite direction if it is seen at the
position of "Right circle".
11.2 Circular vial
[Checks]
① Adjust by the plate level vial beforehand.
② Confirm the position of the bubble of the circular vial.
At this time, it is not necessary to adjust if the bubble is at the centre of the circle.
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