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 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 and sleek 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 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 securely tightening the battery compartment and switch. 4. Tighten the adapter and insert the tail tube into the target tube, ensuring the switch side faces upward. Secure the device and perform calibration using a sight or scope. 5. Adjust the sight or scope until the collimator’s light spot is parallel to the reference point for accurate alignment.