The subject of chronographs has probably been discussed here before, but I'm new. Can I get a recommendation on a reliable chronograph? I looked at reviews on Midway and the ones I researched seemed pretty unreliable.
Check the CED M2. I have been using one for three years now and they are available at Grafs.
I very seldom get an error. The secret is to keep the sun out of the sensors.
The CED website has video tutorials. The M2 costs a little more than others at approx. $190, but it is worth it to me. Most others here go for,the cheaper ones and it depends on what you want out of it.
You can get usable ones for just over a hundred, and better ones for $50 more. For $190, I'm betting the CED M2 is as good or better than the $150 chronographs, but also comes with some extras that you will find convenient.