The version 3 of DSO Nano differs from version 2 in that it does not use white plastic shell. Instead, it uses black metal shell which is more durable and rugged.
Okay, it’s nothing fancy but it is really useful. Plug your power supply into one end and the other into your project and, just like that, you’ve got a power switch! The on-off rocker switch has a good stiff ‘click’ to it, so it isn’t easy to accidentally switch.