1.25 Inch Red Laser Collimator & 2 Inch Adapter for Newtonian and SCT Telescope Come with a 2'' adapter, easy fit into 1.25'' or 2'' focuser, 7 adjustable brightness level. Easy to observe the laser target and adjust the sealed screws on the body until the red dot is centered, no need to keep looking at the eyepiece of telescope for long time. Feature: Easy and time saving to collimate 1.25'' and 2'' telescopes, come with a 2'' removable adapter. 7 adjustable brightness level for amazing alignment in dark and day. Wavelength 635-655nm and less than 5mW output power for safe use. Adjust the sealed screws for easy collimation. Aluminum alloy constructed for long time service. Perfect for Newtonian telescope, SCA and Reflector telescope. Specification: Material: Aluminum alloy Output power: <5mW Wavelength: 635-655nm Brightness: 7 Powered by: 1*CR-2032 Size: 103.4*31.7mm/ 4.0*1.2in Total length: 137mm/ 5.3in Weight(collimator): 82g/ 2.8oz Weight(adapter): 53g/ 1.8oz