Had a Shooting Chrony, purchased in the '99 time frame as I recall. It's still ticking but in other hands. Light was a problem, solved by removing the sun shades on bright days with Ol' Sol overhead.
About 2-3 years ago I purchased a Pro Chrono with a little box that gives a readout by the shooter. Both have been cross checked, same day, same loads, results varied about 3-5 fps as I recall. I like the Pro Chrono. I have tried for over 20 years to shoot one of the dang things but have failed miserably. Tips appreciated.
DD