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 and convenient to operate. Features: - Constructed from high-grade aluminum alloy for durability, light weight, and resistance to corrosion - Infrared calibrator emits a laser beam with long-distance visibility, bright and clear output to assist in precise calibration adjustments - High-precision design requires no additional calibration; the laser enables accurate and convenient alignment of straight tubes - Battery compartment features a simple, sleek 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 crosshead screwdriver to attach the adapter to the tail of the collimator tube. 3. Ensure the collimator is aligned properly by tightening the battery compartment and switch to maintain a straight pen body. 4. Secure the adapter and insert the tail tube into the target tube, ensuring the switch side faces 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.