Angle cosine indicator for Eratac mounts. Allows the shooter to determine aim elevation based on aim slope. The Eratac elevation turret attaches to the Eratac spirit level without changing the position of the scope.
How to use ACI:
1. Measure the distance to the target by your rangefinder
2. Sight the target and read the number indicated on the angle cosine indicator; multiply the actual distance by the cosine shown to get the distance adjusted for the tilt of the weapon.
The Angle Correction Indicator (ACI) is an essential tool for long range precision shots when aiming up or down. ACI helps you easily calculate and correct the effect of gravity on the trajectory of your bullet.
