Custom-made (tailor-made or ready-to-use) solution is a solution (single or multi-element) prepared according your specific needs and requirements: analytes, analysis, matrixes, concentrations. Custom-made solution is a product, with a real practical application compared to the conventional standard solutions (element standard or multi-element standard). Instead of gathering 2 or more conventional solutions you simply order one you need. You will achieve correct results without any interference of the other components: matrix, type and concentration of analytes. Furthermore you will avoid any errors due to preparing, precipitation mixing of incompatible solutions, calculations, contamination etc