The first thing to do is set up the monkey. This must be done by placing the magnet and the target on the stand and securing them. The height can be adjusted to any height necessary.
The shooter is set up a given distance away from the target and aimed at it. Then, when the system is turned on, without moving anything, the projectile is fired at the target. Simultaneously, the target is dropped from its position. The projectile will leave a mark on the target where it hit.
This procedure is repeated for different distances and different heights with the deviation from the center of the target always marked.