The Siemens QFM81.21 is a reliable room hygrostat designed to monitor and control humidity levels within a range of 15 to 95 percent relative humidity. This device features an adjustable setpoint located inside the unit, allowing for precise calibration to meet specific environmental requirements. With an IP55 rating, it offers solid protection against dust and water, making it suitable for various industrial settings. Distributed through BSP Automation, the QFM81.21 provides effective humidity regulation for maintaining optimal conditions in your facility.