Johnson Level & Tool Mfg. 40-6936 User Manual

Page 32

• Turn the instrument 180º.

• If the target remains at the center of the reticle, no adjustment is

required. Otherwise, adjust as follows.

Calibrating
• Turn counterclockwise and remove the black

ring/adjusting screw cover located between
the optical eyepiece and the focusing knob.

• Place a sheet of paper under the instrument

and mark the optical plummet center mark
each time the instrument turns 90º, as shown in the figure:
point A, B, C, D.

• Line up points AC and BD to get the point of their intersection O.

• Adjust the four adjusting screws on the optical eyepiece with the

adjusting pin to align the center mark with point O.

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