(1263) Весы для измерения прогиба стрелы

Весы для измерения прогиба стрелы.
Known as an arrow scale, its purpose is to measure the flex of an arrow.
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Весы для измерения прогиба стрелы. Фото из Инета

This 300 spine arrow should have a deflection of .300 inches, however when measure on a spine testing device the arrow is shown to have a spine closer to .312 inches