ABCDEFGHIJKL
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You can modify the green cells
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If I measure at10m
of distance ("a" on the drawing below)
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and I am20cm
below horizontal (b)
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then I measure10.0020m(c) rather than 10.0000m
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I have added2.0
mm to the real measure (a).
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In most cases, perfect horizontality is not important to get very accurate measurements.
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However, if the wall is not vertical (in an attic for example), the error can be much higher, as we "add" the slope of the roof (case "Attic" below)
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