This laser calibrator is made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistance, and with long service life. Highly accurate and adjustment-free design, the calibrator utilizes laser light, with a tube straight in for a more convenient and precise adjustment. Features: Made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistance, and with long service life. Laser calibrator, light has a long-distance, bright, and clear beam, which better helps calibration adjustment. Highly accurate and adjustment-free design, the calibrator utilizes laser light, with a tube straight in for a more convenient and precise adjustment. The battery compartment design is simple and elegant; the tail part can be opened by unscrewing, convenient and practical. Specifications: Name: Laser Calibrator Material: Aluminum alloy Color: Red, green (optional) Battery: 1 x CR2 battery, 3V, 800mAh (included)