The Wheeler Trigger Pull Scale accurately measures trigger pull weight from 8 ounces to 8 pounds. It features an ergonomically shaped handle for consistent direction of pull. Highly visible increment markings and easy to read sliding indicator that stays not eh maximum weight registered make it easy to read. It measures in 2 ounce increments and is accurate to +/- 2 oz. The trigger pull scale is an excellent tool for use when adjusting triggers to ensure accuracy and maintain safe performance. Accurately measures trigger pull weight Easy to read sliding indicator Range: 8oz to 8lbs (2oz increments)