Calibration measurement materials in the nature of chemicals for use in industry and science as standards and reference materials, namely, certified samples of chemicals, minerals, trace elements, radioactive elements, and isotopes to be used in the calibration of measuring instruments used for measuring and determining the composition of other materials

'calibr':1,37 'certifi':21 'chemic':8,24 'composit':47 'determin':45 'element':27,29 'industri':12 'instrument':40 'isotop':31 'materi':3,19,50 'measur':2,39,43 'miner':25 'name':20 'natur':6 'radioact':28 'refer':18 'sampl':22 'scienc':14 'standard':16 'trace':26 'use':10,34,41

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