While the first version of iGrill was larger than an iPhone, and ran on four AA batteries, this newer edition is only an inch and a half wide and deep, and three-quarters of an inch tall. On top of the red plastic body is a silver plastic ring, with a black face inside it. There, you’ll find a glowing rounded square, which changes color to indicate how close your food is to the proper level of doneness. Instead of relying on user-provided batteries,…