To the shareholders of Vaisala Corporation

We have audited the accounting records, the financial statements and the administration of Vaisala Corporation for the period 1.1. - 31.12.2005. The Board of Directors and the Managing Director have prepared the report of the Board of Directors and the consolidated financial statements prepared in accordance with International Financial Reporting Standards as adopted by the EU and the parent company’s financial statements prepared in accordance with prevailing regulations in Finland, that include the parent company’s balance sheet, income statement, cash flow statement and the notes to the financial statements. Based on our audit, we express an opinion on the consolidated financial statements, the parent company’s financial statements and on the administration of the parent company.

We have conducted the audit in accordance with Finnish Standards on Auditing. Those standards require that we perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining on a test basis evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by the management as well as evaluating the overall financial statement presentation. The purpose of our audit of administration is to examine that the members of the Board of Directors and the Managing Director of the parent company have complied with the rules of the Companies' Act.

Consolidated financial statements

In our opinion the consolidated financial statements give a true and fair view, as referred to in the International Financial Reporting Standards as adopted by the EU and defined in the Finnish Accounting Act, of the consolidated results of operations as well as of the financial position. The consolidated financial statements can be adopted.

Parent company’s financial statements and administration

In our opinion the parent company’s financial statements have been prepared in accordance with the Finnish Accounting Act and other rules and regulations governing the preparation of financial statements in Finland . The financial statements give a true and fair view, as defined in the Finnish Accounting Act, of the parent company's result of operations as well as of the financial position. The financial statements can be adopted and the members of the Board of Directors and the Managing Director of the parent company can be discharged from liability for the period audited by us. The proposal by the Board of Directors regarding the distributable funds is in compliance with the Companies’ Act.

Helsinki, 14 February 2006

PricewaterhouseCoopers Oy
Authorised Public Accountants

Mikko Nieminen
Authorised Public Accountant

Jukka Ala-Mello
Authorised Public Accountant