I've never got on with stopwatches. I seem to drop them or reset them when I'm flying. I have found a cheap digital watch with nice big numbers on it which works really well for me. If you have a Decathlon near you, go and have a look. I recently bought a black Geonaute watch from there for about 8 quid. It has a chrono and big numbers and not much else (other than a strap). You have to hold the reset button down for a few seconds before the chrono resets itself, which is godsend if you are reaching behind the seat for a chart (which seems to happen all too often)