The Beiter Balance Clip is a small, but important tool.
It helps to determine the balance point of the arrow and allows to easily calculate the F.O.C. (=front of center), the percentage of the balance point from the mid of the arrow.

With the Balance Clip not only you can determine the balance point of a single arrow, but also the difference in balance of a series of arrows.
Simply measure every balance point on each arrow of your series (dozen) with a pencil.
Align the arrows and you will see, if the lines you have marked on the shaft are all on the same height!

Following the calculation formula of the F.O.C in %:
FOC %=((L/2)-S) *100/L
e.g. L=780, S=290 is a F.O.C. of 12,82%