This laser calibrator is made of high-grade aluminum alloy material, which is lightweight, strong, and corrosion-resistant, designed for a long service life. The product includes a full set of accessories, ready to use upon arrival and convenient to operate. Features: - Constructed from high-grade aluminum alloy for durability, light weight, and resistance to corrosion - Infrared calibrator with laser light that provides long-distance, bright, and clear visibility to assist in accurate calibration adjustments - High-precision, adjustment-free design uses laser technology for convenient and accurate alignment of straight tubes - 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 aligned in a straight line by tightening the battery compartment and switch securely. 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.