Depending on whether or not you have kids, you likely have some familiarity with ultrasound machine. Perhaps when you’ve been around them you were impressed with the custom interface, and wondered if you could use some version of the machine for various home uses. Well now you can, with Kelu124’s ultrasound processing module.
Though this kind of technology seems like an incredible bargain at $149 before shipping, as shown in the image below from its Hackaday.io page, getting a useful ultrasound image from it takes quite a bit of assembly and added hardware. Still, compared to the tens of thousands of dollars you might pay for a commercial model, this might be worth it for some applications.
Besides possible complications setting it up, the project’s author notes on that, “Though an engineer, this project is the first of its sort, I never did something related. Bear with us, and the discovery process – but I’m happy to learn on the way =).” Besides equipment issues, for medical use at least, there is the small detail of years of schooling to learn to operate one of these machines properly and interpret results properly. Perhaps it would be best to use it on non-living things!