Vaisala Oyj is a Finland-based company engaged in the development, manufacture and marketing of observation and measurement products and services for meteorology, weather critical operations and controlled environments. The Company�s operations are divided into three business areas. The Weather operating segment is a provider of weather technology for meteorological institutions, roads and rail authorities, airport organizations, defense forces, energy and maritime. Controlled Environment segment offers products and services to life science customers and multiple applications in various industries. As of December 31, 2011, the Company had subsidiaries in such countries as Australia, Canada, China, Germany, France, Japan, Malaysia, the United Kingdom and the United States. In December 2013, it acquired 3TIER Inc.