The more thermometer (digital alarm clock, small weather station, ...) I have compared with each other, the greater were the differences. Here I also made notice that the deviations of the tested thermometer at different temperatures differ fails. So you can not assume that a thermometer consistently has 1 degree deviation. These are, for example, at a temperature of 19 ° C 1 degree deviation and at 22 ° C only 0.5 degrees deviation from the bulk of mass. Nevertheless, the two were always at the ground and that speaks for them.
Unfortunately, the operating instructions are not in German or in English but NL, E, I +!?! Packaging is but held mainly in German. This is not critical because the two buttons are self-explanatory and the battery compartment will also see each and get open.