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©2016 Johnson Level & Tool - Rev. 1
5. Move the tripod as close as possible to wall B, and make the
cross dot project on staff/wall A. Make a mark and label as
‘A2’.
6. Rotate the instrument by 180° and move the cross dot to proj-
ect on staff/wall B. Make a mark and label as ‘B2’.
7. Calculate the vertical distance (A1-A2) – (B1-B2) = e
8. If e> 3/32" at 15 ft, the instrument is out of tolerance and
must be calibrated.
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