Scientific apparatus and instruments, namely, X-ray fluorescence spectrometers for measuring the elemental composition of materials, other than for medical purposes; scientific instruments, namely, X-ray fluorescence spectrometers for detecting the elemental composition of materials, other than for medical purposes; scientific apparatus and instruments, namely, spectrometers for laboratory use; X-ray fluorescence analyzers; x-ray spectrometers for laboratory use; Scientific apparatus and inst...