[cerebellum42]

I think a hotness measuring device would be more likely used by enthusiasts who grow their own chilies and want to find out how hot thy turned out - especially since the same breed may be significantly hotter or milder depending on when you harvest and what conditions they grew in.

[CydeWeys]

That makes sense, if it's targeted for gardeners. However, I suspect that the reason it uses dissolved dried peppers is because that's the easiest way to do it, as the capsaicin would dissolve into solution and be measurable that way. I'm not seeing how you could as easily measure the capsaicin content in a fresh chile pepper; you're not gonna get the capsaicin to go into concentration so that eliminates most of the typical measuring methods.

Separately, I do suspect that a lot of the serious gardeners growing chile peppers are already drying chiles anyway, as you get a lot more in a harvest than you'd want to eat immediately and the dried form stores and travels better. You can air dry them, oven dry them, use a dehydrator, etc. So I think the biggest problem here is the time lag before being able to make the measurement, depending on your drying method.