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 for immediate application. 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, adjustment-free design uses laser technology for more convenient and accurate alignment of straight tubes - Battery compartment features a simple, sleek design; the tail cap opens by unscrewing for easy access, ensuring practicality and ease of use How to use the collimator: 1. Measure the inner diameter of the tube and select the appropriate adapter (includes eight small black tips). 2. Use a cross-head screwdriver to attach the adapter to the tail end of the collimator tube. 3. Ensure the collimator is aligned in a straight line by securely tightening the battery compartment and switch. 4. Attach the adapter and insert the tail tube into the target tube, making sure the switch side faces upward. Secure 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.