Vaisala - Company Announcement

Vaisala's January - March (Q1/2011) results published on May 6, 2011

Vaisala Stock Exchange Release 29.04.2011 at 3:15 p.m.


Vaisala publishes its Q1/2011 results on Friday, May 6, 2011 at 9:00 a.m. The
stock exchange release will be available on the company website
atwww.vaisala.com. CEO's presentation will be published at 12.00 noon (GMT +2)
on the same day at www.vaisala.com/investors.

Briefing
Briefing for analysts and media will be arranged in Tapahtumatalo Bank, Meeting
Point 2nd fl, Unioninkatu 20, Helsinki, starting at 12.00 a.m. Please register
to the briefing by email toliisa.ahtiluoto@vaisala.com.

Audiocast
A live audiocast of the presentation of Kjell Forsén, President and CEO of
Vaisala, will be sent starting at 12.00 a.m. (GMT +2). The audiocast will be
available atwww.vaisala.com/investors. It will be recorded and published at the
same address at 2.00 p.m. (GMT +2) on the same day.


More information: Liisa Ahtiluoto, Communications Manager, tel. +358 40 730 7695

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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 meteorology, weather critical operations and
controlled environments. Headquartered in Finland, Vaisala employs over 1300
professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange.
www.vaisala.com


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