What is the first step in marking an out-of-specification reading?

The first step in marking an out-of-specification reading is to circle it in red. This practice is commonly used in engineering and quality control contexts to quickly highlight values that do not meet established specifications. The use of red makes the out-of-specification reading immediately distinguishable from valid readings, ensuring that it captures the attention of anyone reviewing the data.

Circling the reading in red symbolizes a warning or alert, prompting further investigation or corrective action. This method enhances the visibility of critical issues in documentation and reporting processes, facilitating better communication within teams regarding potential problems that require resolution.