Diversified industrial company Danaher Corp
The deal represents an 11 percent premium to Beckman's closing price on Friday, and a roughly 45 percent premium over its price in December before rumors of a deal entered the marketplace, according to Beckman.
Beckman shares jumped 10 percent to $82.70 in premarket trading, while Danaher fell 10 cents to $47.88.
The transaction is valued at about $6.8 billion, including assumed debt, the companies said. The deal is expected to close in the first half of 2011.
Beckman Coulter, which has annual revenue of about $3.7 billion, would become part of Danaher's Life Sciences and Diagnostics segment.
Last December, sources told Reuters that Beckman had hired Goldman Sachs
Prior to that, Beckman had experienced a volatile year in which Chief Executive Officer Scott Garrett suddenly resigned after a high-profile recall of its troponin test and quality-control issues.
(Reporting by Lewis Krauskopf; Editing by Derek Caney and Lisa Von Ahn)