Yes. And commercial ones are also specified for a single impedance. Often 50 Ohm. If the impedance changes, so does the voltage. That's the nature of these instruments...
I like both the ease of use as well as the potential of both the Raspberry Pi Zero and BBC:Micro Bit, the price is also an excellent thing for them to be considered by wide use within an educational format with very little budget. Some facilities are able to obtain full STEM projects like Robotics and similar where as others will be hard pressed to obtain a Raspberry PI Zero and the accessories it needs to be usable.
The reason I had thought possibly the UNO is the huge support it has for a variety of projects and already has been introduced to a lot of people. I have given educators RPi Zero's who had never touched a RPi but had played with arduino projects.
The Codebug purely for the option of simplistic and safe tweaking for brand new people. I am sure some of the Arduino Flora projects would also be of interest.
The big thing was coming up with some base parameters to allow our fine Members to brain storm and try and provide interesting applications that could be use for education. Hopefully all ages, not just the right about to go to College ages. :-)
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