outside rather weak cooling power, only 12.5 ° C at 21 ° C

Have measured inside today the cooling plate. She feels pretty cool to when we pass them, but measured it with a thermometer the temperature only 12.5 ° C at 21 ° C ambient temperature. That's not enough to keep a drink cool reasonable, especially since even a temperature gradient must be present. Down to a drink to cool is not to be thought as the walls are only 1.5mm plastic and not isolated. Schade had more hoped, a more expensive product will now try.