This Fuel Gauge Mug is a weird but fascinating idea. A heat sensitive scale printed onto the outside lets you know exactly how much liquid you’ve got left to go. Like, you’re having difficulty peering over the top of the cup, see? Maybe you’re a tad too short? Anyhoo, it’s yours for £8.16.
That means when the cup is full and hot, the gauge will show as full and as you guzzle your coffee down (or as the temperature of the contents is too cold to drink), your gauge corresponds to the contents current level until it goes down to empty. So you know, and so will others around you, exactly when it’s time to re-fuel.