It doesn't get any better than a Thermapen IMOHO. I have two of them, an older one that I've had for seven or eight years and a newer Splashproof model that I've had for maybe three. My oldest one ran for over five years on the original battery and in that time never drifted so much as a single degree. I've tested it any times in an ice bath and boiling water as well as in my calibrated sous vide bath and it's dead on the money (it agrees to the tenth of a degree with the readings of my SV gear, in fact). In a dense substance like meat or water it reads and stabilizes in about 3 seconds, too. It's pricey but if it both of mine died or were stolen I'd be on their website to get a new one the same day.
