Cappuccino thermometers are a great tool to assist in frothing milk to the ideal temperature range of 140 to 160 degrees F. To ensure an optimal froth and conistency, maintain a temperature that it is the middle of this range. Anything at the low end of the spectrum will yield lukewarm results and exceeding the upper end of the spectrum will cause you to scald the milk resulting in a burnt taste.
Sealed dial to prevent fogging
Colored temperature zone indicator for quick reference