I'm laughing because I've never seen an instrument or IC that will check the temperature and if it is out of the guaranteed range, it will refuse to work. The guaranteed range may be from binning or may be from some subtle difference of the way that part is made or the parts that the instrument is made of (eg, the manufacturer may simply be using the wider temperature grade parts from their suppliers, and the suppliers may simply be binning parts based on manufacturing testing), but there is never a lockout. What happens is simply that the performance was not tested by the manufacturer out of that range and it is not guaranteed to work or work quite to quoted tolerances. TC is a real thing! But hey, you might get lucky. In fact, you might get lucky nearly all of the time, depending on different factors. But there is no lockout like you were talking about.