A Mug for the Blind that Chimes When It's Full
If you're visually impaired, it can be hard to... ...ou're visually impaired, it can be hard to fill a mug (or any other vessel) without spilling over the e... ...ther vessel) without spilling over the edge. The Braun Bell Mug beeps at each of three different levels, so the u...
https://www.neatorama.com/2009/08/09/a-mug-for-the-blind-that-chimes-when-its-full/
