This laer calibrator is made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistance, and with long service time. Highly accurate and adjustment-free design, the calibrator utilizes infrared light, with a tube straight in for a more convenient and precise adjustment. 8-hole adjustable adapter, suitable for 0.177 to 0.50 caliber. Features: Made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistance, and with long service time. Infrared calibrator, laser light has a long-distance, bright, and clear light, which better helps calibration adjustment. Highly accurate and adjustment-free design, the calibrator utilizes infrared light, with a tube straight in for a more convenient and precise adjustment. The battery compartment design is simple and beautiful, the tail part can be opened by unscrewing, convenient and practical. 8-hole adjustable adapter, suitable for 0.177 to 0.50 caliber. Specifications: Name: Laser Calibrator Material: aluminum alloy Color: red, green (optional) Battery: 1 x CR2 battery (included) Power: