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 - Simple and sleek battery compartment design; the tail cap opens by unscrewing for easy access, making it practical and user-friendly 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 of the collimator tube. 3. Ensure the collimator is aligned in a straight line by tightening both the battery compartment and the switch securely. 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 aligns parallel with the reference point for accurate calibration.