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The Bosch GLL 3-80 Professional Line Laser Kit is the most precise laser level we have tested, accurate to ± 0.2 mm/m up to a range 80 meters when used with a laser detector and 40 meters used without. It projects One horizontal and 2 vertical 360° lines enable many new applications for simultaneous marking, alignment and leveling indoors. Its rated to IP54 so is extremly robust and deisgned to take the the knocks and drops of a busy work place. Very high spec model perfect for a range of different jobs and designed for professional tradesmen. Comes complete with universal mount. This model get a 5 star rating and its hard to find any faults, the cost is expensive when compared to lower spec models but nothing compares to the quality and reliability. Would highly recommend to any tradesmen.