Classification of atomic absorption spectrophotometers specialized for quantitative analysis of metallic elements. Equipment group that atomizes samples and measures metal concentrations with high precision through light absorption at specific wavelengths. Used in manufacturing for component management of metallic materials, plating solution analysis, heavy metal measurement in wastewater, and alloy composition verification. Classified by atomization methods including flame type, electrothermal type, and hydride generation type, capable of trace metal analysis from ppm to ppb levels. Differs from ICP optical emission spectrometers in atomization method and measurement principle, specialized for high-precision quantitative analysis of single elements.