Usage Tips:This Laser Calibrator Is Made Of High-Grade Aluminum Alloy Material, Which Is Light In Weight, High In Strength, Corrosion-Resistant And Has A Long Service Life.The Goods Include A Full Set Of Accessories, Which Are Ready To Use Upon Arrival And More Convenient To Use.Features: Made Of High-Grade Aluminum Alloy Material, It Is Light In Weight, High In Strength, Corrosion-Resistant And Has A Long Service Life.Infrared Calibrator, Laser Light Has Long-Distance, Bright And Clear Light, Which Better Helps Calibration Adjustment.High-Precision Adjustment-Free Design, The Calibrator Uses Laser, And The Straight Tube Can Be Adjusted More Conveniently And Accurately. The Battery Compartment Design Is Simple And Beautiful, And The Tail Can Be Opened By Unscrewing, Which Is Convenient And Practical.1. How To Use The Collimator: 1. Measure The Inner Diameter Of The Tube And Choose A Suitable Adapter (8 Small Black Heads). 2. Use A Cross Screw Tool To Twist The Adapter To The Tail Of The Collimator Tube. 3. To Ensure That The Collimator Itself Is In A Straight Line, Pay Attention To Tighten The Battery Compartment And The Switch. Only In This Way Can The Pen Body Be In A Straight Line. 4. Tighten The Adapter And Insert The Tail Tube Into The Tube. When Inserting, The Front Of The Switch Must Face Up. Fix The Machine And Calibrate It With The Sight Or Scope. 5. Adjust The Sight Or Scope To Make The Collimator Light Spot Parallel To The Collimator Light Spot, So It Is Accurate.