16 ©2019 Johnson Level & Tool - Rev. 3
8. Accuracy Check
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
The laser must be checked before operation to ensure accuracy.
X & Y Direction Accuracy Check
1. Note the X & Y direction on top of the laser.
2. Place the unit on a platform or tripod that is 5′ away from
one wall and 50′ away from another wall indoors, with the
X-direction facing the wall head-on. Turn the unit on.
3. Mark on the wall where the beam hits the close wall (5′) as X= and
on the far wall (50′) as X-.
4. Turn the instrument 180° being careful not to change the HI (height
of the instrument). Mark on the close wall X- and far wall X=.
5. Measure the vertical distance between X= and X- at the far wall.
If X= and X- are more than 1/8″ apart at 50′, the unit is out of
calibration. Note: If there is a vertical distance at the close wall,
the HI was changed when the laser was rotated 180°.
6. Turn the instrument by 90° and place it on the platform, with
the Y-direction facing the wall. Perform Y-direction accuracy
check with the same method as X-direction check, and mark
point Y- and point Y= similarly.
7. If point C and point D are within 1/8″ at 50′, the accuracy is
within tolerance.
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