Chronograph watch can be quite confusing (especially the analog type), but trust me, once you’ve got the hang of it, it will be easy to read. Let’s get into the analog type first as it’s the harder one to read.
First of all, there are many subdials (or the small circles on the dial) that will be used to tell time. I’m sure you’re well aware about the normal 3-hands analog watch (1 hand or needle each to show the hour, minute and second). The subdials are placed on the dial to show/record the time for the chronograph.
There will be a dedicated subdial to show the seconds (placed at the below part of the watch pictured here), a subdial for minutes (left side) and a subdial for hours (right side). If you look closely, you will notice that the seconds and minutes subdials have 60 parts while the hour subdial only has 24 parts (denoted by its markers).
This shows that this particular chronograph can only track time up to 24 hours since that’s the maximum hours that it can display on its chronograph subdial. This is important to know about because some chronographs can only show lower amount of hours while others can go on for longer.
This brings me to another point: there are many chronograph designs out there. For example, the subdials can be positioned elsewhere, there might not be a seconds subdial and instead it will use the main seconds hand for chronograph, there might not even be a subdial for hours, etc.
It’s good to know that many chronograph design exist and you just have to figure it out by yourselves by remembering the basic anatomy of it.
For a digital chronograph, things are much simpler as the tracked time is displayed right there on the screen. There’s not much guess work needed here.