Thread: Chronograph advice

I have an early Prochrono (before the digital model) and a Magnetospeed. The Prochrono sometimes gives some weird readings, mainly on sunny days when the light is coming from an angle, but when I used both together, two of the shots were within 1fps, if I recall correctly the third shot had a 30fps difference.
For your use, I would try to borrow one, or team up with a forum member who has one.