Steve Mollmann wrote:
What's wrong with it is that a roentgen is a real thing that I can look up. Not even Memory Alpha is sure what a kellicam actually is.
We don't know what size
it is, but we can assume from context that it's a Klingon unit of measurement. It stands to reason that Klingon sensors would be calibrated to give distances in those units and that Klingon officers would therefore report a ship's distance in those units even when speaking English. The point is, it's not just a different word for the same thing; it's a different thing, a unit of different size. So using that term isn't arbitrary.