SVBONY Red Laser Collimator for Newtonian  Reflector Telescope Alignment 1.25'' 7 Bright Levels Triple Cemented Lens with 2" Adapter SVBONY user adjustable laser collimator;allows anyone easily collimate 1.25'' and 2'' reflector telescopes;come with removable 2" adapter;built with metal material;make alignment no longer boring and time consuming Super easy to use;accurate collimation in a few minutes provide a more clearer image;no longer have to go back forth;just watch the collimator from the mirror end of the scope and adjust the screws 7 brightness levels red laser beam;adjustable brightness;suit for different light conditions;amazing alignment in dark and day;so can get the better views possible from your reflector telescope Best quality solid metal body;for a long term use;CR2032 battery included and comes with a full set of instructions with a step by step procedure on how to properly align a relfecting telescope Adjustable collimator;it has 3 collimation sealed screws on the body;if find it lose collimation; can manual calibrate it;lifetime warranty;we confidently promise lifetime warranty for every one bought from us