There are a number of alignment techniques that just won’t work without lighting the reticle in your instrument. Our universal light source fits every instrument and eyepiece that we make, putting autoreflection, autocollimation, and reticle projection within easy grasp. Use our battery-powered light source in the field when AC outlets are scarce. (Note: you may need an adapter to use our light source on some of the older accessories – see product page for details.)