©2011 Johnson Level & Tool - Rev. 1
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Vertical Accuracy Check
1. Turn on the digital level and put it on a smooth and vertical plane as
shown in figure 5. Wait 10 seconds until the data reading is stable
and then record the angle degree.
2. Rotate the digital level 180º on the same plane, see figure 6, wait
10 seconds until the display data is stable then record the second
degree value.
3. Turn over the digital level in the same plane, figure 7, wait 10
seconds and record the third degree value when it is stable.
4. Rotate the digital level 180º in the same plane, figure 8, wait 10
seconds and write down the fourth degree value when stable.
5. Of the four degree readings, if any two of the values have a differ-
ence over 0.1º, the unit must have a new Zero plumb recalibration.
Horizontal Calibration
1. Turn on the instrument and put it on a smooth and horizontal sur-
face, figure 9. Press and hold in for 5 seconds the Zero Calibration
key, -0- will show on LCD display. Wait ten seconds then press
the Zero key again, the LCD will show -1-.
2. Rotate the digital level 180º on the same plane, figure 10, wait 10
seconds and press the Zero key until the LCD displays -2-.
Figure 5
Figure 6
Figure 7
Figure 8
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