The GilAir Plus is a state-of-the-art personal air sampling pump that offers improved performance, increased flexibility, and superior design and comfort. With its wide dynamic flow and pressure range, this pump can be used for all personal air sampling methods with a flow range of 20 to 5,000 cc/min. Featuring QuadModeSM technology, it can easily switch between high-flow constant pressure and constant flow (450-5,000 cc/min) and low-flow constant pressure and constant flow (20-499 cc/min) without needing external adaptors. Essentially, it's like having two pumps in one.