Re: Chronographs?
I use the CED M2, and it has proven to be tough, accurate, and reliable in a variety of lighting conditions. I've had the display unit yanked from the hood of my truck onto the concrete - denting the case, but it still works fine. The tripod with the eyes and sky-screens have blown over onto rocky surfaces more than once - they still work fine. The sky screens have been shot off by less than careful friends (Brad, "How did that happen!"). We just order more.
For a scientific instrument that has to handle redneck abuse, I give it thumbs up!
Chops