How is sanitizer checked for its effectiveness?

Using sanitizer strips is the correct method for checking the effectiveness of a sanitizer. These strips are designed to provide a direct reading of the sanitizer's concentration, which is crucial for ensuring that the solution is potent enough to effectively eliminate pathogens. When the strip comes into contact with the sanitizer, it reacts and changes color based on the concentration of active ingredients present. This allows users to quickly assess whether the level of sanitizer is within the recommended range for safety and efficacy.

In contrast, observing color changes superficially might not provide accurate or relevant information regarding the actual effectiveness of the sanitizer, as it does not quantify the concentration. Using a thermometer is not applicable here, as temperature does not directly correlate with sanitizer efficacy. Lastly, taste testing is not a safe or valid method for determining sanitizer effectiveness, as sanitizers are not meant for ingestion and can be harmful if consumed.