Bosch Professional GLM 50-27 CG Original Instructions Manual page 37

Accuracy Check of the Distance Measurement
For the accuracy check, the measurement should be taken under favourable conditions,
i.e. the measuring section should be indoors and the target surface for the measurement
should be smooth and reflect well (e.g. a white-painted wall).
Select a measuring section of approx. 3 to 10 m long, the length of which you know ex-
actly (e.g. room width, doorway).
Measure the section 10 times in succession.
The deviation of individual measurements from the exact known value may be max-
imum ±2 mm throughout the entire measuring section under favourable conditions.
Log the measurements, so that you can compare their accuracy at a later point of time.
Working with the Tripod (Accessory)
The use of a tripod is helpful, particularly for greater distances.
Place the measuring tool with the 1/4" thread (14) on the quick-release plate of the
tripod (25) or of a commercially available camera tripod.
Tighten the measuring tool with the quick-release plate locking screw.
Set the reference level for measurements with a tripod (see "Selecting the Reference
Level", page 18).
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