Wheeler Engineering Trigger Pull Scale - This product features an ergonomically shaped handle for consistent direction of pull. Highly visible increment markings and an easy-to-read sliding indicator that stays on the maximum weight registered make it easy to use. It measures in 2 oz. increments and is accurate to plus/minus 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 pullEasy-to-read sliding indicatorRanges from 8 oz to 8 lbs