Spelt your name wrong before, sorry.
I don't have the chronograph, but 2 different versions of the Stopwatch meter (and one for sale). I also have the Watkins stopwatch meter, been looking for the chronographs for some time. I…"
Looks as though it might be some sort of range finder, but I've not seen one that shape.
Incidentally, Adam's also made a Stopwatch meter. Actually a stop watch with their actinometer on the back.