Kware - Engineer/Math Mug - Heat Sensitive Color Changing Coffee Mug 12oz for Birthday, Graduation or Special day gift idea (Regular Box)

My son loves it. He’s going to university to be an engineer

This mug is a simple gift with a unique twist. Perfect for anyone in your life who works in mathematics/sciences and is proud of it. The images on the mug are hard to see when it's empty, and then spring to color when you fill with hot or cold liquid. It works quickly! Beware, you can't put this in the dishwasher or microwave.

This mug is so vibrant against the black, i love it! I bought this as a gift for my boyfriend and he's been using it everyday. The outside you can see where the design line was applied so you have to carefully hand wash it, not to start a peel

The effect really does work, although as you drink your hot liquid or it fades, you can see a residual outline of the previously visible equations. The busy-ness of the mug, however, detracts significantly from the effect.

Really love this mug, it is my morning everyday companion. The size, the content, and the quality is great. Works perfect every time i add my hot coffee in the morning and able to see the formula's answers. Recommended.