This gadget was the key to the best steak I've ever cooked

I love steak. That's why, for most of my adult life, I've tried to hone my skills at cooking it. Grilling, pan-frying, broiling — I've done it all, with all kinds of cuts. But a new kind of cooking gadget has taken my steaks to the next level. It's called the Joule, and when I first saw its promise of cooking perfectly done steaks (via a Facebook ad), I was intrigued, but skeptical. A white cylinder roughly the size of Luke Skywalker's lightsaber handle would supposedly cook steaks better