All chronies are sensitive to light, that's what makes them work. They "see" the shadow of the bullet passing over the photo sensitive cell. Ya just have to be smarter than sunshine or a cloudy day, and you can make'm work for you instead of against ya.
Guess I didn't make myself clear in my previous post.
The "Crony" I had wouldn't read reliably in the sun or the shade, with or without the sky screens. I was fortunate enough to have access to other chronographs while I was trying to use the Crony. It helped me to see how a quality product should work. Thus my choice of the Pact. Recent experience with the club's chrono has convinced that a decent one can be had for under $200. For my money, it's not the Chrony,
Savage