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 with a laser beam that provides long-distance, bright, and clear visibility to assist in precise calibration adjustments - High-precision, adjustment-free design utilizing laser technology for more accurate and convenient alignment of straight tubes - Simple and sleek battery compartment design; the tail cap opens by unscrewing for easy access, making it practical and user-friendly 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 end of the collimator tube. 3. Ensure the collimator is straight by tightening the battery compartment and switch securely to maintain alignment of the body. 4. Secure the adapter and insert the tail tube into the target tube, ensuring the switch side is facing upward. Mount the device and align it with the sight or scope. 5. Adjust the sight or scope until the laser dot is parallel to the reference point for accurate calibration.