Another vote for the Oehler 35P. The computer part of the chrono is separate from the skyscreens so you shouldn't be able to shoot it when it is sitting on the bench next to you. All parts are available in the event something does get winged by a bullet.

I have owned several different chronos over the years and this one is by far the least finicky of all of them. It generates accurate results in lighting conditions that cause others to completely stop reading.