I bought two of these, one for the fridge and one for the freezer. At a room temperature of 75 degrees, one measures 75 degrees, the other 78 degrees. Unfortunately, there is no way to customize. Since the safe range for the fridge is around 6 degrees (34-40) according to this thermometer, I put the most accurate in the fridge. The safe range for the freezer is 20 degrees (0-20 below zero according to this thermometer) so I put the less accurate one in the freezer knowing it had to read less than 4 degrees below zero to be sure . Overall I was very disappointed with the Rubbermaid product. You have to get at least two to know if one is inaccurate, so pretty much pointless. They appear to be well made and look solid, but don't seem to have been tested for accuracy. They are made in China and lately there seems to be little to no quality control on products made in China. If I had known they were made in China I would not have bought them because of the human rights violations in China.
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