The "Angle Cosine Indicator," ®is a simple tool for hunters in mountainous terrain, and utilized to obtain their corrected for gravity distance to target.
The ACI® is a vault solid, water resistant precision instrument; quiet and made from aircraft grade aluminum, which is anodized in a flat black color.
The Co-Sine numbers are Laser Engraved onto the body in five (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.