Johnson Level & Tool Mfg. 40-6065 - Manual (Page 11)

©2012 Johnson Level & Tool - Rev. 2 11
Measuring an angle.
8. Self-Check and Fine Calibration
To guarantee the best measuring precision of the incline, vertical and
leveling plane:
Calibrate before first use.
Before important measurements.
After a hit or drop.
Horizontal Calibration Check
Put the level on a smooth level plane and observe the LCD display.
Note the reading after 10 seconds. Then turn the level 180º on the
same plane. After another 10 seconds note the second reading.
Calibration is necessary if the difference between the two measuring
readings is over 0.2º.
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
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