Washington, D.C., – Danaher Corporation (NYSE: DHR) (“Danaher”) announced today that, due to severe weather on the East Coast of the United States, it has extended the tender offer, through its wholly owned subsidiary Daphne Acquisition Corporation, for all outstanding shares of common stock of IRIS International, Inc. (NASDAQ: IRIS) (“IRIS”) to 5:00 p.m., New York City time, on October 31, 2012, unless further extended. The tender offer was previously scheduled to expire at 12:00 midnight, New York City time, on October 29, 2012.

The tender offer is being made in accordance with the previously announced Agreement and Plan of Merger, dated September 17, 2012, by and among Danaher, Daphne Acquisition Corporation and IRIS (the “Merger Agreement”). Except for the extension of the expiration date, all other terms and conditions of the tender offer remain unchanged.

The depositary for the tender offer has advised Danaher that, as of approximately 5:30 p.m., New York City Time, on October 29, 2012, stockholders of IRIS validly tendered approximately 15,807,016 shares of IRIS common stock (not counting as validly tendered, shares that were tendered through notice of guaranteed delivery and not actually delivered) representing approximately 86% of the IRIS shares outstanding.

This press release is neither an offer to purchase nor a solicitation of an offer to sell shares of IRIS.

About Danaher

Danaher is a science and technology leader that designs, manufactures, and markets innovative products and services to professional, medical, industrial, and commercial customers. Our premier brands are among the most highly recognized in each of the markets we serve. The Danaher Business System provides a foundation to our 59,000 associates around the world, serving customers in more than 125 countries. In 2011, we generated $16.1 billion of revenue. For more information please visit our website: www.danaher.com.

Notice to Investors

This announcement is neither an offer to purchase nor a solicitation of an offer to sell securities. Danaher and Daphne Acquisition Corporation have filed a tender offer statement with the SEC, and have mailed an offer to purchase, forms of letter of transmittal and related documents to IRIS stockholders. IRIS has filed with the SEC, and has mailed to IRIS stockholders a solicitation/recommendation statement on Schedule 14D-9. These documents contain important information that should be read carefully before any decision is made with respect to the tender offer. Those materials will be made available to IRIS security holders at no expense to them. In addition, all of those materials (and all other offer documents filed with the SEC) will be available at no charge on the SEC’s Web site: www.sec.gov.