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The CST/Berger 57-LMH-CU Electronic Self Leveling Single Beam Rotary Laser Level offers fast and simple leveling power to handle your toughest jobs with less manpower. With one button operation, the 57-LMH-CU laser level levels itself via electronic sensors interfaced with motors and precision software eliminating the need for re-leveling or rechecks. The built in Anti-Drift System (ADS) or height of instrument alert provides peace of mind when working on busy job sites, by alerting the operator that the instrument has been moved due to tripod movement, accidental bumps or ground settling. Additionally, the 57-LMH-CU achieves an accuracy of 3/32" at 100ft and has a working range of up to 1000ft in diameter when used with the included Upgraded LD400YEL 7-Channel Laser Detector. The 57-LMH-CU laser level has a self leveling range of +/-3 degrees which takes the guess work out of setting up the instrument. Just make sure that the tripod head is generally level, place the 57-LMH-CU laser level on the tripod and turn it on. The 57-LMH-CU laser level takes care of the rest. The 57-LMH-CU laser level has a rotation speed of 600RPM which makes the 57-LMH-CU useful for not only general leveling with the detector and rod, but also with many laser machine control systems available. The 57-LMH-CU laser level is powered by 4 standard D-cell alkaline batteries which will power the unit for up to 75+ hours of continuous operation, and the 57-LMH-CU laser level features a battery level indicator that will alert you when the power is running low. This keeps you up and running day in and day out. The 57-LMH-CU laser level also features a heavy duty glass enclosed laser beacon. This enclosed beacon allows the unit to be used in almost all weather conditions. Included with each kit: 57-LMH-CU Rotary Laser Level,