I followed the general opinion to buy a cooking thermometer choosing this one, but I'm picky the first thing I did was to check: - When unpacking it indicated 17 instead of 21 - 2 hours later (so that the thermometer starts at room temperature) it indicated 25 ° C - In boiling water it showed 92 ° C.
I have trouble understanding how it is possible to make such an unreliable instrument ... That said I may have fallen on a failed model. In any case Amazon has accepted my return smoothly.