We manufacture, assemble, and calibrate all of our optical instruments in our underground facility in Kansas City, Missouri. Our collimator barrels are ground and honed to extremely precise tolerances for roundness and concentricity. Our 271 tilt colimator has a special reticle which allows estimations of angular deviation from a reference point. Our multiple target collimator (MTC) optically simulates a variety of distances from close focus to infinity.