Which type of fit test uses machines?

The correct answer is quantitative fit testing. This method uses specialized machines to measure the concentration of contaminants inside and outside a respirator during a fit test. By calculating the ratio of these concentrations, the quantitative fit test provides a numeric result that determines how well the respirator fits the individual. It provides an objective measurement of fit, which is crucial for ensuring that workers are protected from harmful airborne contaminants, such as lead dust during abatement activities.

In contrast, qualitative fit testing relies on the subjective responses of the individual being tested, who reports whether they can detect a test agent (like a bitter or sweet taste or a scent) while wearing the respirator. Physical and auditory tests do not specifically pertain to fit testing protocols defined for respirators. Thus, quantitative fit testing stands out for its use of machinery to provide precise and objective results regarding respirator fit.