Balance grain

In archery, the unit of measurement is grain (0.0648 grams).
The grain scale is a very precise measuring instrument used in archery to weigh the weight of an arrowhead, an arrow, a shaft, or a tube.

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MTM DS-750 mini digital grain scale

MTM DS-750 mini digital grain scale

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Description

What is the grain scale used for in archery?

Standardize the set of tubes, shafts, and arrows

The goal is to sort by weight the tubes, shafts, and arrows. Even if manufacturers do this upstream (this is the principle of arrow sorting), weighing shafts in particular is a common practice for traditional archery, to ensure a homogeneous set and consistent results from one arrow to another.

Control the total weight of an arrow

The total grain weight is important for: 

- calculating arrow FOC
- spine selection
- equipment integrity

Optimize performance

The desired total arrow weight will depend on the practice. For example, for hunting, a heavy arrow will be preferred for better penetration. It will also be more stable.

Conversely, a light arrow will be faster and reduce the sight marks.

Comply with current regulations

For certain types of hunting, a minimum arrow weight must be respected.

Similarly, limb and bow manufacturers usually guarantee their equipment only if it is used with a minimum grain weight per pound drawn.