They develop and manufacture products and services for environmental and industrial measurement.
Vaisala’s origins date back to the 1930’s when Professor Vilho Väisälä, Vaisala’s founder and long-time managing director, invented some of the operating principles of a radiosonde. He sent the first Finnish radiosonde aloft in December 1931….History – Vaisala
The HMT331 is the top-of-the-line wall-mounted transmitter for demanding HVAC and condition monitoring applications.
“The instrument offers a wide variety of different psychrometric units, including dew point, enthalpy, wet bulb temperature, absolute humidity, and mixing ratio.”
Vanha Nurmijärventie 21, 01670 Vantaa
P.O. Box 26, FI-00421 Helsinki, Finland