I export InTemp to check if my USB connection to the First Offset dropped 
dead.

InTemp      $current.inTemp.format(add_label=False)
InTemp      $current.inTemp.raw

What will be produced in case of null data? What do I need to test? 

In the first case, I expect N/A to mean USB connection is lost. I am 
guessing N/A will not be in raw data. An empty field?

So, probably the first line is a better choice for such purpose?

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