One of the key indicators of firearm proficiency is shot grouping. To determine this indicator, you can use the Grouping Card from Ecopybook Tactical. This ruler has small dimensions and easily fits in a pocket or pouch.

The material from which the ruler is made is a flexible matte, anti-glare surface that does not reflect sunlight and does not reveal your position. To determine the grouping, simply attach this Grouping Card to the shooting target.