SRM

calibration measurement materials, namely, samples of metals, alloys, chemicals, minerals, fertilizers, botanicals, gases, biologicals, carbides, glasses, cements, trace elements, radioactive materials, isotopics, reference fuels, rubber materials, and computer tapes all of which the chemical composition of the same has been certified and is used in the calibration of measuring instruments for the measurement, calibration, and specific determination of the composition of other materials to be tested