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 light 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 operation How to use the collimator: 1. Measure the inner diameter of the tube and select a suitable 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 body remains straight by securely tightening the battery compartment and switch. 4. Attach the adapter and insert the tail tube into the target tube, ensuring the switch side faces upward. Secure the device and align using a sight or scope. 5. Adjust the sight or scope until the laser dot aligns parallel with the reference point for accurate calibration.