> A stepped dial would solve this. I've used many stepped-dial microwaves, and not a single one of them would be good for blind users. The step often changes s

> A stepped dial would solve this. I've used many stepped-dial microwaves, and not a single one of them would be good for blind users. The step often changes size after a certain point and steps are often missed. If you're aiming for six and a half minutes, having to do mental arithmetic or keep careful track is not fun ("12 ticks to reach a minute and then 11 ticks of half minutes, and let's hope it actually got them all"). In my direct experience, the best interfaces for blind users are ones that can have tactile/braille labels applied and ones with voice feedback, in that order.