I love the DSO Nano. It is perfect for so many quick uses. You never need an isolation transformer. It works fine in the field because it is so portable. Rechargeable batteries via standard USB. The list goes on and on…
Two issues with the DSO:
- It does not have AC coupling
- It does not have 4mm banana sockets
Both of these are solved with a little adapter I built.
The antispam thing won’t let me put in a url for the details until tomorrow. 
