BERWYN, Pa. (AP) -- Ametek, a maker of electronic instruments and electro-mechanical devices, has purchased Teseq Group for 83 million Swiss francs ($92 million).

Privately held Teseq makes test and measurement instruments for electromagnetic compatibility testing. It is based in Luterbach, Switzerland.

Teseq has manufacturing and development operations in Luterbach as well as Germany, the U.K. and the U.S. It has direct sales offices in China, France, Germany, Japan, Singapore, Switzerland, Taiwan, the U.K. and the U.S. Teseq will become part of Ametek's electronic instruments group.

Last month Ametek, which is based in Berwyn, Pa., announced that it acquired privately held Powervar for about $128 million.