9 Scientific, weighing, checking (supervision) apparatus and instruments; measuring equipment including/containing certified samples of materials, for use exclusively for calibrating this measuring equipment, such as metals, alloys, chemicals, minerals, fertilizers, botanical products, gases, biological products, carbides, glass, cements, trace elements, radioactive materials (in particular plutonium, uranium, thorium, cesium, americium, radium, europium), molybdenum, isotopic products, reference fuels, rubber goods; computer cassettes used for measuring, calibrating and for the specific determination of said materials; laboratory apparatus and instruments made of glass, test tubes, retorts including bottles and flasks for chemical tests, inspection, sampling as well as for preserving, without any loss, chemical solutions and reagents.; Scientific, weighing, checking (supervision) apparatus and instruments; measuring equipment including/containing certified samples of materials, for use exclusively for calibrating this measuring equipment, such as metals, alloys, chemicals, minerals, fertilizers, botanical products, gases, biological products, carbides, glass, cements, trace elements, radioactive materials (in particular plutonium, uranium, thorium, cesium, americium, radium, europium), molybdenum, isotopic products, reference fuels, rubber goods; computer cassettes used for measuring, calibrating and for the specific determination of said materials; laboratory apparatus and instruments made of glass, test tubes, retorts including bottles and flasks for chemical tests, inspection, sampling as well as for preserving, without any loss, chemical solutions and reagents.