It happens rarely, but occasionally a user performs a test list on the wrong unit and it might be nice if it was possible to change the unit after a test list has been completed. .
The current method of dealing with this is to simply transcribe the results to the correct unit and delete the errant list.
This is simple enough, but a bit of a pain for the user. Need to investigate whether the increased code complexity is worth the gain for the rare user convenience gained.