Yes, a Nano could be programmed to do this task, but I'm thinking of something that needs no user programming for newcomers to use. If a newcomer to Arduino was advised to troubleshoot by taking some voltage readings of their design, you wouldn't make their first task to build a multimeter.
I've gotten into the habit of testing a design by taking a serial data stream straight off a GPS module. When powered the GPS pours data out of its TX pin. No programming required. Gives nice legible ascii text.
So, are there cheaper off the shelf sensors that do something similar? Doesn't matter what the text is, so long as it's human-readable.