Beiter Limb Line Gauges, sometimes colloquially known as "Beiter Blocks", are a simple and effective precision tool for tuning. They help you check arrow position, centershot, limb alignment, and more. You will also be able to check the straightness of the limbs with the Limb Gauges.
Simply secure the gauges on your top and bottom limbs, and check alignment of your string or arrow against the markings on the gauges.
Sold in pairs.