Johnson 40-6601 - Horizontal Line Transverse Accuracy Check

12 ©2018 Johnson Level & Tool - Rev. 1
Horizontal Line Transverse Accuracy Check
Transverse accuracy refers to the accuracy of the horizontal laser
beam projected along the wall and ensures the beam is level from
left to right.
1. Set the instrument on a tripod and place approximately 15′ from
a wall.
2. Unlock and power the unit on.
3. Face the laser line to the wall, and set the center as Point A.
4. Make a mark on the wall for Point A.
5. Make another mark on the wall 8′ from Point A and mark on the
wall as Point M.
6. Rotate the instrument 90° and make a mark on the wall 15′ from
Point A. Label this mark as Point B.
7. Measure the distance ‘e’ from Point M to the laser line, as per the
figure. If ‘e’ < 3/16″, then the tool is properly calibrated.
8 ft (2.5m)
15 ft (5m)
8 ft (2.5m)
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