Digital Absolute + Axis Goniometer (Built In) Undercast Padding 3 years (1 year for Maxi pouch 3 years (1 year for spare parts) from the date of shipment under normal use and service but desirable sounds and louder The integral absolute vertical and horizontal levels are permanently incorporated into the digital goniometer arm * Goniometer reads 0 180 degrees on LCD screen * Has ability to freeze angle measurement * Powered by 1 9V battery * Goniometer exterior is powder coated steel with inch cm marks screened onto arms * Digital angle reached in center * Horizontal and vertical levels to indicate level or plumb starting point *