Compact, portable, and easy-to-use Vaisala HUMICAP® HM40 handheld humidity meter is designed for spot-checking in a wide variety of environments. It provides reliable measurements in a wide range of applications. It is the ideal spot-checking tool for everything from structural moisture measurement and air conditioning systems to humidity measurement in industrial production processes and life science applications. There are four different models available: HM41, HM42, HM45, and HM46.
Key Benefits
Compact, portable, and easy to use with an intuitive user interface available in 10 languages
Accuracy on par with Vaisala’s high-end measurement solutions
Measures multiple humidity and temperature parameters
Numerical, statistical, and graphical trend views to track changes and confirm measurement stability
Delivered with a calibration certificate; probes are removable and interchangeable
Preserving valuable artworks requires precise control of environmental conditions. The Vaisala HM40 Handheld humidity and temperature meter supports art conservators and museum professionals by providing fast, reliable, and highly accurate humidity and temperature measurements in galleries, storage areas, and during restoration work.
Accurate humidity control is critical, as even small variations can cause canvas deformation, paint flaking, or long-term material degradation. The HM40 enables conservators to verify that strict environmental requirements—often specified in international loan agreements—are met and maintained. During delicate restoration processes, such as controlled humidification of canvases,