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Extreme Safety : Bosch GLL 2-15 Professional Self-Levelling Cross Line Laser, 15 m Measuring, +/-0.3 mm/m Accuracy, +/-4 deg Auto Leveling, 2 Beams, (3) 1.5 V LR6 AA Batteries
User manual Bosch GLL 2-15 Professional (English - 311 pages)