Levenhuk C800 NG Digital Camera, USB 2.0 - Manual (Page 115)

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objects type (The type could be the same or could be different).
14.6 Vertical
14.6.1 Vertical>Four Points.
1. Move mouse and click its left button to mark the 1st point.
2. Move mouse and click its left button to mark the 2nd point. A line (the 1 st line)
connect these two point be overlaid on the image
3. Move mouse and click its left button to mark the 3rd point.
4. Move mouse again, one will find the 4th point is always restricted to perpendicular
to the line of point 1 and point 2. Click to mark the 4th point. Two vertical lines will be
labeled and numbered.
Note : 1) To check or modify the parameters of the selected object, just select a single
measurement object and the Measurement sidebar will be activated automatically.
Here you can edit the corresponding object parameters to modify its properties;
2) The Appearance , Coordinates on Measurement sidebar will be enabled only
when a single object is selected. The Calculation will be effective for a single selected
object or more selected objects. Its calculated items will depend on the selected
objects type (The type could be the same or could be different).
14.6.2 Vertical>Three Points
1. Move mouse and click its left button to mark the 1 st point;
2. Move mouse and click its left button to mark the 2nd point. A line (the 1 st line)
connecting these two points will be overlaid on the image;