Which statement about Bi-Metallic stemmed thermometers is inaccurate?

The statement regarding bi-metallic stemmed thermometers being used for taking surface temperature of foods is inaccurate because these thermometers are designed primarily to measure the internal temperature of food, not the surface temperature. They work by having a metal stem that conducts heat, allowing you to insert it into the thickest part of the food, where it can accurately gauge the internal temperature, which is critical for ensuring food safety.

In contrast, the other statements correctly describe the nature of bi-metallic stemmed thermometers. They do not require batteries, making them user-friendly and reliable in various environments, including outdoor settings or during power outages. They are also accurate within a tolerance of +/- 2 degrees Fahrenheit when properly calibrated, ensuring that they provide a reliable indication of food temperatures. Additionally, they do not contain mercury, making them safer to use compared to some other types of thermometers that may pose a risk if broken.