What type of instrument is a rotameter primarily used for?

A rotameter is primarily used for measuring the flow rate of liquids or gases in various applications, including air sampling. Specifically, it provides a visual indication of flow rates through a tapered tube, where the height of a floating element within the tube corresponds to the flow rate. This makes it particularly suitable for calibrating air sampling pumps, as it allows assessors to verify that the pump is operating at the correct flow rate, ensuring accurate sampling.

While other instruments may be designed for measuring humidity, testing airflow direction, or monitoring temperature changes, the rotameter is specifically focused on quantifying fluid flow. This distinction solidifies its primary use in air sampling and calibration tasks within the mold assessment field.