14 ©2018 Johnson Level & Tool - Rev. 1
5. Move the tripod as close as possible to wall B, and make the
cross dot project on the staff/wall A. Make a mark and label
as A2.
6. Rotate the instrument by 180° and move the cross dot to project
on the staff/wall B. Make a mark and label as B2.
7. Calculate the vertical distance (A1-A2) – (B1-B2) = e
8. If e < 3/16″ at 15′, the instrument is properly calibrated.
2891i-3English_Manuals 6/4/18 10:26 AM Page 14
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