"The Digital Laser Level and Angle Locator displays angle and inclination simultaneously, with angle measurements in degrees and a working range angle of 0 to 182.5. Automatic digit inversion for overhead measurements. Magnetic base. Battery Included Yes, Display Shows , , mm/m, in./ft. decimal, in./ft. fraction, Battery Type AA, Angle Reference 0.1, Color Black/Gray, Length in. 20, Laser Type Digital, Display Type LCD, Accuracy 0.1 for 0/90 0.2 for 1-89, Case Included Yes. Angle inclination in 5 construction languages - units of measure degrees, percent, mm/m, in/ft in decimal, in/ft in fractional Automatic shut-off Hold function to hold measurement Locking arm increases length to 3ft., 3 1/2in. Arm can be locked in all positions Visible laser beam to extend working range Laser wavelength 650nm10nm Laser classification Class IIIa Maximum power output 5mW Resolution 0.1 or 0.1 Working angle inclination 0-90 Working temperature 14F to 113F -10C to +45C Center screw thread 5/8in.-11"