Mounts perpendicular to Lev-o-gage, as a fore-and-aft trim aid. Monitors tilt from -10 to 10 degrees. Brass indicator ball rides in special damping fluid with a Saturn yellow color, making it easy to read. Tube assembly is made out of a rugged copolymer "flex tube" for ultimate durability. Housing is constructed of durable ABS plastic. Includes a piece of 3M VHB (Very-High Bond) tape on the back for easy mounting. Its convenient size will allow for mounting on almost any surface.