Probably hear lots of this, but I've been guessing my water temperature for a while now, always leaning towards what my body feels is lukewarm. Recently I bought a glass thermometer to standardize my process and keep it consistent. It sits at 78F when just laying around and only goes to 68F if throw it in nothing but colder water from my tap. Anything other than straight cold water from the tap puts it at 80F or higher. I developed a roll with it and it seemed far underdeveloped. Is it possible that my thermometer is just wrong?