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Before doing any precision levelling it is advised to check the calibration of the unit.
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Set up the laser on a tripod at about 30m facing a wall or staff with a detector.
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Allow the unit to level.
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Detect and note laser position on the wall or staff.
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Without moving the tripod rotate the unit 180°.
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Detect and note laser position on the wall or staff.
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Calculate the distance between the two readings.
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The difference should be within 6mm at 30m.
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If the unit is out of calibration it is advised to send it in to Spot-on.
(see www.spoton.com.au for details)
CHECKING CALIBRATION
