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It has to do with the light being perfect in order to work. Also it won't work anywhere near power lines. I never read the instructions on my Pro Chrono. I never had to. It just works every time. When I bought my old Chrony it came with cheapo cardboard stands that blew off after any muzzle blast. I bought a lot of replacements trying to keep it working. Then they came out with cheapo plastic ones that did the same thing. I got the Pro Chrono and never looked back. The Chrony is buried somewhere in the back of my junk closet.
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