This Laser Calibrator is made of high-grade aluminum alloy material, which is lightweight, strong, corrosion-resistant, and designed for 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 accurate calibration adjustments - High-precision design requires no additional calibration; the laser enables convenient and accurate alignment of straight tubes - Battery compartment has a sleek, simple 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 end of the collimator tube. 3. Ensure the collimator is straight by tightening both the battery compartment and the 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 your sight or scope. 5. Adjust the sight or scope until the laser dot is parallel to the target point for precise calibration.