The Prochrono does not care one bit about light conditions. Heavy overcast, bright and sunny, high noon, sun down, sunrise, partly cloudy. You shoot, it reads it. I still have my shooting chrony as well but it just is not in the same ball park. I have yet, in ten years, found any condition in which it does not work. When you need readings it will work PERIOD.

My first Chronograph used the paper screens. you put in two and when it broke the wires it would read. However one of the guys got a 17 Remington and the bullets were so small that they would go between the circuit wires and wouldn.t break them. The papers were expensive as well and it cost about a buck and a half per shot. I then had a Pact which was a good machine but I sold it in harder times. The next was the shooting chrony and it worked when the conditions were just right but often I would have to come back later in the day or something because the light conditions were not right. I am tickled to death with this one and wouldn't trade it for anything else out there. Its cheap and it works every time.