Haha, gadget as in IoT crap, maybe, but we're for-sure the market for: aeropress, sous-vide devices (yes some do them DIY but...), dedicated pizza ovens, and so on. You got a gadget to prepare food or drinks that already have other ways to prepare them, HN's not a crazy place to market it. Bonus if it's "sciency" or can be described as more "authentic".
But of course we're not like the stupid plebs falling for those silly devices we don't like.
(mind, I'm far from immune to this, so I'm not just casting stones at others—oh I am getting one of those pizza ovens at some point. That's happening.)