Danaher Corp., Washington, D.C., has agreed to buy Tektronix, Inc., Beaverton, Ore., in a deal valued at $2.8 billion.

Tektronix would become part of Danaher's Electronic Test platform, joining its Everett-Wash.-based Fluke and Fluke Networks businesses, and nearly doubling the platform's revenues. Fluke is the largest manufacturer of test equipment in the electrical market.

With annual revenues of approximately $1.1 billion, Tektronix is a supplier of high-end test, measurement, and monitoring products and services for engineers in the communications, computer, consumer electronics and education industries, as well as in military/aerospace, semiconductor and a range of other industries worldwide.

Tektronix manufactures high-end test equipment outside the range of test equipment sold in the electrical wholesaling industry. One source said if you want a Tektronix spectrum analyzer, you probably wouldn't find one at your typical electrical supply house.

The Tektronix transaction is expected to be completed in the fourth quarter of 2007.