SUMMONS TO ANNUAL GENERAL MEETING OF VAISALA OYJ

Vantaa, FINLAND


The Annual General Meeting of Vaisala Oyj will be held on Thursday,
14th March 2002 at 5 p.m. at Vaisala Oyj's head office in Vantaa,
Vanha Nurmijärventie 21, 01670 Vantaa, Finland.

The meeting will consider the matters appointed in § 13 of the
Articles of Association.

A shareholder who, at the latest on 4th March 2002, was entered as a
shareholder in the company's shareholder's register kept by the
Finnish Central Securities Depository Ltd. shall be entitled to attend
the meeting of shareholders. A shareholder whose shares have not been
transferred to the book-entry securities system shall also be entitled
to attend the meeting of shareholders provided that he or she was
registered in the company's share register prior to 21st October 1994.
In this case, the shareholder shall present the meeting of
shareholders with his or her share certificate or other evidence to
show that the right of ownership to the shares has not been
transferred to a book-entry securities account.

Documents relating to the financial statements and the Board of
Directors' proposals to the meeting of shareholders may be viewed in
copies by the shareholders for a week prior to the meeting of
shareholders at the company's head office in Vantaa, at the address
Vanha Nurmijärventie 21, and copies of these shall be sent upon
request to the shareholders.

In order to be able to attend the meeting of shareholders, a
shareholder shall register with the company by 4 p.m. on 8th March
2002 at the latest. Registration can be performed by the deadline
either in writing to the address Vaisala Oyj, Nina Andersin, PL 26,
00421 Helsinki, by facsimile to +358 (0)9 8949 2206, by e-mail to
nina.andersin@vaisala.com or on weekdays, 9 - 12 a.m. by telephone on
+358 (0)9 8949 2201. Any power of attorney on the grounds of which an
authorised person wishes to exercise a shareholder's right to vote at
the meeting should be sent to the company before the end of the
registration period.

Vantaa, February 14, 2002

Vaisala Oyj
Board of Directors


Further information:
Olli Karikorpi, Finance Director             +358 9 8949 2215 or
                                             +358 40 777 2933
Tiina Hansson, Communications Director       +358 9 8949 2728 or
                                             +358 40 730 3751

Vaisala Oyj




Distribution:
Helsinki Stock Exchanges