©2011 Johnson Level & Tool - Rev. 1 11
Vertical Calibration
1. Turn on the instrument and put it on a smooth and vertical sur-
face, figure 13. The two side surfaces of the benchmark
should be as parallel as possible, such as glass door or win-
dow. 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 to the other vertical surface, figure 14, wait
10 seconds and press the Zero key until the LCD displays -2-.
3. Turn the unit over, still on the same plane making it upside
down, as in figure 16, then press the Zero key until the LCD
displays -0-.
4. After 10 seconds, press the Zero key again until the LCD
displays -1-.
5. Turn the digital level back to the first vertical surface on the
same benchmark plane, figure 15, wait 10 seconds, and press
the Zero key again until the LCD displays -2-.
6. The vertical calibration is complete.
Figure 13 Figure 14
Figure 15
Figure 16
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