Pour your favorite hot beverage into Art Lebedev's Battery Mug, and the indicator on the side will be visible as long as the liquid within is above 96.8°F. As you quaff that coffee or tea, its green indicator will show you how much is left, and if its temperature drops too far, the green indicators will fade to black.
Sure, there have been plenty of heat-sensitive cups before, including some depicting young females in various stages of undress, but we like this one better. And we like Art Lebedev, Russian designer extraordinaire whose imagination is often more expansive than practicality permits. Want one of these cups? It's yours for $20.
GET IT at Art Lebedev.