WITH ALL FLATLINE OPS PRODUCTS
The Flatline Ops Military Spec Angle Cosine Indicator® (ACI®) mounts to either our STRONG ARM™ or SLOT LOCK™ adapter and takes the guesswork out of uphill and downhill precision, long-range shooting. An angle cosine indicator is a simple tool for hunters to use in mountainous terrain to obtain their distance to target, corrected for gravity.
Solid, Durable Construction
Based on the principles of our ADI, this version of the ACI is guaranteed watertight and is manufactured per US Military Directives. The ACI is a vault-solid, precision instrument, silent (per military specs), and constructed from aircraft grade aluminum, which is anodized in a flat black color. Cosine numbers are laser-engraved onto the body in five degree increments, and the lens is shatterproof, shockproof, and resistant to chemicals such as acetone and cleaning solvents. Completely mechanical, there are no batteries or electronics to fail.