Laser Level Accuracy +/-1/16 in @ 100 ft Battery Type Alkaline Bluetooth Not Bluetooth Compatible Features Ideal for Site Layouts Crosscut Measurements Slope Conveyor Grade and Transit Work Mark the Center of the Laser Dot and Subtract 1/2 in to Reference the Bottom of the Level Optical Calibration No Set Screws Turn the Laser on By Turning the Battery Cap Switch Wedge Prisms Factory Calibrated - No Field Adjustments Required Working Edge is Machine Flat to 0.005 in