It’s a little tricky but you can take a screenshot on Apple Watch, handy when you want a live shot of an app your developing. Or perhaps you want a lasting reminder of some notification or other. Either way, follow these steps:
1. Get a good grip of your Apple watch.
If you wear with the side buttons facing your hand:
Placing your thumb on the smooth side
Rest your first finger over the digital crown
Rest your middle finger on the side button
If you wear with the side buttons facing your elbow:
Placing your first finger on the smooth side
Rest your thumb over the digital crown and the side button
2. Press the digital crown and side button at the same time.
The two buttons pressed at the same time will result in a screenshot of the current display. A flash of the screen accompanied by the camera shutter sound signifies a successful screenshot.
3. View and share the image
The screenshot from your Apple watch is saved to the paired iPhones camera roll. Open photos on iPhone to view your screenshot. Tap the share button to view the options.
P.S. you can see the full Apple Watch user guide here: apple.co/1IPuZoa
Rob Bamforth's Blog 