Fangrui Product Details Material:made Of Abs Material,light Weight And Portable To Carry Outside, Handheld Device. Graphic Lcd Screen Display:an Airsoft Chronograph With Accuracy That Gives You The Most Exact Detailed Readings; Compact In Size, So This Chronograph Can Be Taken Anywhere. Extra Large Size Diameter: 25mm. You Can Even Measure The Velocity Of Paintball. Function - Shooting Chronograph Is A Great Way To Measure Your Airsoft Guns Power Ince Many Barrels Have Twists/ Inch Rifled Inch And The Handle Needs To Spin! For Rate Of Fire, Muzzle Velocity, Power Of Joule And Prediction Distance. 1/4 Inch Standard Adapter Interface For Tripod Mount.the Testing Must Be Carried On Under A Safe Environment To Prevent Yourself And Others From Hurting By The Shooting. Overview: Popular Amongst The Airsoft Community, Our Shooting Chronograph Is Capable Of Calculating Your Muzzle Velocity, Power Of Joule, Prediction Distance And Rate Of Fire. Graphic Lcd Display, Great Controls And Compact Size. Its Accurate With Readings And