Keep it simple with the KS 100H horizontal electronic self-leveling rotary laser for precise leveling applications, ideal for outdoor use such as:  Leveling, checking elevations, concrete forms Installation of decks, pools, drop ceilings, floors Excavating, digging footings, septic systems Features  Simple button operation, easy to use ±3/16-in at 100-ft (4.5mm at 30m) leveling accuracy Up to 1000-ft (300m) working range Electronic self-leveling Manual Mode allows laser to be tilted for simple slope applications Anti-Drift System alerts user when laser has been disturbed or drifts Enclosed Rotor Housing keeps laser safe from tough job site conditions 2 Year Warranty Specifications Leveling Accuracy ±3/16" (±4.5 mm) Leveling Type Electronic, ±4° Working Range (dia.) Without Detector: N/A With Detector: 1,000ft (300m) Functions Slope: N/A Scanning: N/A Height Alert: Yes Rotation Speed(s): 600RPM Power Supply 4-C Alkaline Environment IP54, Water/Dust Resistant 27-KS100H  Standard Kit Includes:  KS 100H Rotary Laser, Detector w/bracket, Alkaline batteries, Carrying case, and User guide.