High quality product from Sniper Tools Design Co. The Sniper Tools Angle Cosine Indicator (ACI,) is a simple tool for snipers/hunters in mountainous terrain for determining the angle to the target so that adjustments can be made to achieve the correct Point-of-Impact. The “Mil Spec” ACI is a vault solid, water proof precision instrument (as per US Military Specs;) quiet, and made from aircraft grade aluminum, which is anodized in a flat black color. The cosine numbers are laser engraved onto the body in 5-degree increments. The lens is shatter proof, shock proof, and resistant to chemicals such as acetone and cleaning solvents. Completely mechanical, there are no batteries or electronics to fail.
weight is 22 grams
The Mil-Spec. version is waterproof for 35 min. and 1 meter depth of water.
How to use the ACI:
1. Measure the distance to target by your rangefinder or your scope‘s reticle.
2. Aim at the target and read the number shown on the Angle Cosine Indicator; multiply the actual distance by the shown cosine number to get the adjusted distance for gravity.
Example: target distance = 800 m
Cosine number shown on ACI while aiming at target : 0.87 (approx. 30 deg)
800 x 0.87 = 696 m (adjusted distance to target).
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