Bosch GLL 3-50 Professional
One centimetre here and there is really not inconsequential, use an electric measuring tool to be safe. There's no cord to restrict you, just make sure you've charged the battery.
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From Toolstop
Bosch GLL 3-50 Professional Line Laser
£169.00
Conrad Electronic
Bosch Professional GLL 3-50 Multi-line laser Self-levelling Range (max.): 10 m
£294.94
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