With no batteries or electronics to worry about, the dependable, mechanical Angle Cosine Indicator Kit from Sniper Tools will work no matter what. It takes the guesswork out of angled shots by providing the angle and cosine numerals so you can adjust your hold over for the perfect shot in steep terrain. Use it with ballistic targeting software or on its own to obtain the gravity-corrected distance to your target. Included ring mount attaches easily to your riflescopes main tube and features a built-in bubble level for horizontal accuracy. Durable aircraft-grade aluminum construction with shatter- and shockproof lenses stands up to rough conditions on the hunts. Water-resistant. Available: 1, 30mm, 34mm, 35mm. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.