Ametek Inc., Paoli, Pa., (ametek.com) has acquired Cameca SAS, a manufacturer of high-end elemental analysis equipment used in advanced laboratory research, nanotechnology, and semiconductor applications. Paris-based Cameca, with estimated annual sales of $82 million, was purchased from an investment group for about $112 million. Its products include optical emission and X-ray fluorescence spectrometers for microanalysis, R&D, pharmaceutical, and electronics.