Third-generation Vaisala Radiosondes were developed.

The world's first fully transistorized radiosonde was introduced to the market in the 1960's.

In the 1950's a modern manufacturing plant was relocated in Vantaa and radiosondes were tested further.

In the 1940's prof. Väisälä established a company called Mittari Oy and manufacturing facilities for radiosonde systems.

The first radiosondes were built by Vilho Väisälä in the 1930's.