How accurate must the indicating thermometer be when compared to a certified thermometer?

The accuracy requirement for the indicating thermometer when compared to a certified thermometer is crucial for ensuring that pasteurization processes are conducted within scientifically validated temperature ranges. The correct standard is to maintain an accuracy within +/- 1/2 degree Fahrenheit.

This level of precision is important because pasteurization relies on specific temperature thresholds to effectively kill harmful microorganisms without adversely impacting the quality of the product. A thermometer that is off by even 1 degree could lead to insufficient pasteurization, posing health risks and potentially compromising product safety. Therefore, the stringent accuracy requirement reflects the necessity for precision in temperature measurement during pasteurization.

The other options, while they do propose accuracy limits, do not meet the standards required for food safety and quality assurance in pasteurization. Maintaining such a tight error margin ensures that operators can have confidence in their processes, safeguarding public health.