The HoTech SCA Laser Collimator - Crosshair for Newtonian Telescopes from Explore Scientific is the perfect tool for the serious astronomer. This precision laser collimator provides a quick and accurate collimation of Newtonian telescope optics for perfect observation and imaging. The bright red laser beam is easy to see even in bright light, and the adjustable crosshair makes it easy to accurately adjust the alignment of the telescope optics. If you're looking for a reliable and accurate way to collimate