1、Applicable: Our telescope laser collimator is suitable for mirror telescopes with 25in and 2in reflector telescope that has goodd performance. 2、2inch Adapter: Equipped with a detachable 2inch adapter, the adapter has more uses, and can be used as a focus ring or a threaded adapter. 3、Red Laser: High brightness red laser beam, suitable for different light conditions, can be viewed clearly in both dark and daytime, making alignment no longer boring and time consuming. 4、Easy to Use and Operate: This telescope collimator is easy to use, accurate calibration in minutes, giving your reflecting telescope a better view and image, and it is also easy to operate, just observe the red dot position of the calibrator from the objective end and adjust the corresponding screw. 5、Aluminium Alloy: The telescope collimator is made of premium aluminium alloy material, which is strong, light and durable. 1 x Telescope Laser Collimator Item Type: Telescope Laser CollimatorMaterial: Aluminium alloyGross Weight: 335g/ 11.8ozLaser Color: Red laserInterface Size: 1.25 inches, 31.7mm with 2 inches adapterBattery: Button battery, built in lithium battery, capacity 160mAh, shipped with built in battery