An oven thermometer is more than a “nice to have.” It’s an essential for many home cooks. Why? Because even when you set the oven to 350 degrees, that’s not necessarily ensuring the oven is actually at the pre-set temperature. The temperature of any given oven varies, and the temperature in the middle of the oven—where food is cooked—may vary from the side of the oven, which may be recording the pre-set oven temperature. To ensure safely and evenly cooked food, look for an accurate oven thermometer that is easy to read.