With Astromania Alignment 1.25" Next Generation Laser Collimator for Newtonian Telescopes you will get perfect alignment of your reflector's optics, and faster than with standard collimators. Precise collimation ensures that you will enjoy the sharpest possible images.With this Laser collimator get the best image from your telescope you need to align your telescope regularly and this high quality laser collimator is an essential for this purpose. Wavelength 635-655 nm, output power less than 3.8mW, complies with Class 3R laser safety standards. Seven adjustable brightness levels 1.25" in size. To use for all reflective telescopes 45- degree reticle plate made of aluminum for easier visual accuracy.