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 with laser light that provides long-distance, bright, and clear visibility to assist in precise calibration adjustments - High-precision, adjustment-free design uses laser technology for more convenient and accurate 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 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 device, ensuring the switch side faces upward. Mount the unit and align it with the sight or scope. 5. Adjust the sight or scope until the laser dot is parallel to the target point for accurate calibration.