How accurate must a food thermometer be?

• A. Within ±5°F
• B. Within ±0.5°C
• C. Within ±10°F
• D. Within ±2°F (±1°C) of the standard.

Answer: (D)

Accurate readings matter because you rely on a thermometer to confirm foods reach safe, pathogen-killing temperatures. The standard tolerance used in food safety training is within two degrees Fahrenheit (about one degree Celsius) of the actual temperature. Keeping within this range reduces the risk that you’ll think food is done when it isn’t (or overkill it because you think it’s hotter than it is). If the reading could be off by five or ten degrees, you might miss crucial thresholds like 165°F for poultry or 155°F for ground meats, compromising safety. A tolerance tighter than this, such as within 0.5°C, isn’t the typical requirement and would be harder to maintain in everyday kitchen work. Calibration helps stay within the accepted range, for example by checking against ice water and boiling water to verify the thermometer reads near 32°F (0°C) and 212°F (100°C) at sea level.