So good, the display allows you to view the nearest degree because it indicates eg 36.5 or 36.8 and not simply "36", moreover, it is very reactive and quickly gives the temperature. An indicator light also indicates if the temperature is good. It turns itself off which saves the batteries (supplied) and start-up is via a small button. Once out of the water, it can serve as conventional thermometer to put in a room where else! In truth, the colors are as bright as the picture!