This thermometer seems very precise: it clearly indicates 0 ° C in a water ice melted / ice, and 100 ° C in water being boiled. The size is perfect, neither too big nor too small. I was afraid it is a little big, but I find it more compact than what the pictures and measurements suggest. It is also very highly reactive, it can monitor the temperature in real time. It offers only 4 or 5 seconds to go from 0 ° to 20 ° as soon as I get out of cold water, without doing anything more.