ADA INSTRUMENTS ProLevel 60 Operating Manual page 5

Auto shut off: after 5 minutes of inactivity
Note:
1) The digital level has been pre-calibrated at the factory.
2) The level should only be recalibrated if level has been dropped.
3) "ERRO" shows when either the forward tilt angle or backward tilt angle
is not less 30°.
CALIBRATION
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1. Place the digital level on a flat and smooth surface, press A button
and B button at the same time, the calibration mode is activated and "-1-"
will be displayed. Press A button again, "-1-" will flash briefly. Do not move
until -2- is displayed.
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2. Rotate the level 180° in the same location and press A button, -2- will
flash briefly. Do not move until the unit has completed the calibration and
reset the display to the current level.
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Horizontal
Once the POWER button is turned on, lay the level on the surface you want
to level. In standard ABS mode the LCD display will show the surface you
are measuring as a line either above or below the true level line, and the
degree to which the surface is off, with symbol +/- showing how to adjust
the surface to be leveled. If the beeper is activated, the beeper will sound
at 0° and 90°.
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English