MESA LABORATORIES INC /CO/

We maintain disclosure controls and procedures (as defined in Rule 13a-15(e) promulgated under the Exchange Act) that are designed to ensure that information required to be disclosed in Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Evaluation of Disclosure Controls and Procedures

As of June 30, 2026, we conducted an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report.

Changes in Internal Control Over Financial Reporting

During the three months ended June 30, 2026, there have been no changes to our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that materially affected or are reasonably likely to materially affect our internal control over financial reporting.