When can glass thermometers be used?

Glass thermometers can be used safely when they are enclosed in a shatterproof casing. This is crucial because traditional glass thermometers can break easily, posing a health risk due to the potential for glass and mercury (or other thermometric fluids) contamination. A shatterproof casing helps to prevent breakage and promotes safe handling in a foodservice environment, ensuring that the thermometer can be used without the risk of releasing harmful substances into food or the environment.

While affordability, suitability for warm foods, and correct calibration are important factors when using thermometers, the primary consideration for using glass thermometers safely is the protection against breakage provided by a shatterproof casing. This ensures that they meet safety standards necessary for use in food preparation and service settings.