Created specifically for the precision marksman, The Slope Doper is an aid for determining the correct range when shooting on a slope. The previous standard for this calculation involved a protractor, string and weight along with a logbook of angles and their cosigns. The Slope Doper eliminates the opportunity for mistake not only by printing the numbers right side up for shooters, but also includes the cosign on the device — there is no longer any need to refer to a logbook. After determining the cosign (slope angle factor), multiply it by the distance to obtain the corrected range, and shoot as if the distance were the corrected range.

For additional aid, The Slope Doper also includes valuable ranging and conversion formulas on its reverse side.