This laser calibrator is made of high-grade aluminum alloy material, which is lightweight, high in strength, corrosion-resistant, and designed for a long service life. The product includes a full set of accessories, ready to use upon arrival, offering added convenience. Features: - Constructed from high-grade aluminum alloy for durability, light weight, and resistance to corrosion - Infrared calibrator emits a bright, clear laser beam suitable for long-distance alignment and precise calibration adjustments - High-precision design requires no additional calibration; the laser enables accurate and convenient straight-tube alignment - Simple and sleek battery compartment design with a screw-off tail cap for easy access and practical use How to use the collimator: 1. Measure the inner diameter of the tube and select the appropriate adapter (8 small black tips included). 2. Use a cross-head screwdriver to attach the adapter to the tail of the collimator tube. 3. Ensure the collimator is properly aligned by tightening both the battery compartment and the switch to maintain a straight pen body. 4. Secure the adapter and insert the tail tube into the device, ensuring the switch side faces upward. Mount the unit and align it with your sight or scope. 5. Adjust the sight or scope until the laser dot is parallel to the target point for accurate calibration.