Digital Absolute + Axis Goniometer (Built In) Undercast Padding * Fragranced with natural herbs Foot Massagers Rolls * Fragranced with natural herbs to help you relax restore and rejuvenate * Two part anterior posterior enables full motion of the ankle and knee joints to help prevent stiffness 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 *