Sun Company Lev-o-Gage II - Marine Clinometer | Fore and AFT Trim Aid | Shatterproof Flex-Tube Design Boat Clinometer IDEAL TILT READING - Monitors tilt from -10 to 10 degrees. Brass ball rides in special damping fluid for smooth, accurate readings. EASY TO READ DISPLAY - Brass ball instead of bubble included in bright Saturn yellow tube assembly. Engraved and hand painted numbers make for a functional, easy-to-read display. SHATTERPROOF DESIGN - Tube assembly is made out of a rugged copolymer "flex tube" for ultimate durability. MOUNTS WITH 3M VHB TAPE - Lev-o-gage includes a piece of 3M VHB (Very-High Bond) tape on the back for easy mounting. MADE IN USA - From durable, high-quality materials.