Vaisala Oyj

Report Publication Announcement • Apr 27, 2012

Disclosure 299594

Vaisala - Company Announcement

Vaisala's January - March Results Published on May 4, 2012

Vaisala Corporation Stock Exchange Release 27.4.2012 at 2:00 p.m. Vaisala publishes its Q1/2012 results on Friday, May 4, 2012 at 9:00 a.m. The stock exchange release will be available on the company website at www.vaisala.com. CEO's presentation will be published at 12:00 (GMT +2) on the same day at www.vaisala.com/investors. Briefing Briefing for analysts and media will be arranged in Hotel Kämp, Paavo Nurmi meeting room, Pohjoisesplanadi 29, Helsinki, starting at 12:00 a.m. Please register to the briefing by email to liisa.ahtiluoto@vaisala.com. Audiocast A live audiocast of the presentation of Kjell Forsén, President and CEO, will be sent starting at 12:00 a.m. (GMT +2). The audiocast will be available at www.vaisala.com/investors. It will be recorded and published at 2:00 p.m. (GMT +2) on the same day at the same address. More information: Liisa Ahtiluoto, Communications Manager, tel. +358 40 730 7695 --------------- Vaisala is a global leader in environmental and industrial measurement. Building on 75 years of experience, Vaisala contributes to a better quality of life by providing a comprehensive range of innovative observation and measurement products and services for chosen weather-related and industrial markets. Headquartered in Finland, Vaisala employs approximately 1400 professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange. www.vaisala.com [HUG#1606843]