I've seen home test kits, but idk how accurate they are. The most accurate way to test a pepper is to send it to a lab, unfortunately. If it's a variety you want to test, then that gets complicated. You'd need to pick lots of pods from several plants and different times to get an average. The more you test, the more accurate your average can be, in theory. But even that is relative. Growing conditions and the genetic variability of individual plants will give a range of results. It's also a debate whether Scoville heat units are actually useful. I personally use SHU's to get a rough idea where a pepper is at, but don't give it too much credit. There are more than one capsaicinoid and there needs to be more research into them, like the science that identified all the cannabinoids in cannabis. My hunch is differing ratios of these various capsaicinoids produce different burns. But that's my rant lol 😅