This fork works perfectly for me; I use it for large, daunting roasts and for single chicken breasts to ensure they are cooked through. I think the whole fork needs to be submerged to get an accurate reading. It turns itself off, is idiot proof to operate (i'm certain of this) and should be in every twenty or thirty-something's kitchen. In fact, when I told my somewhat eclectic group of friends (all ladies, from 32 to 78) they were amazed such a device exists and nearly everyone went out to get one. Five stars only begins to cover my enthusiasm for a well-designed, useful gadget such as this.