SPEC: 1. Each scale is hand calibrated from the factory. 2. Whether left or right handed, the Bow Scale is easy to operate, allowing full focus on a smooth draw. 3. Measures in 1-lb. 4. Increments for 20-lbs. to up to 90-lbs. 5. Heavy-duty, corrosion resistant, aluminum housing with stainless steel components. 6. Great for compound bows. 7. The bow scale has peak weight marker to show the top range weight as well as holding or let off weight. 8. Adjust your bow weight for optimal arrow efficiency.