Chemical reagents for quality assurance, other than for medical or veterinary use; chemical preparations for scientific purposes, namely, chemical test solutions for checking the photometric accuracy and linearity of extinction measurements in photometers; chemical preparations for scientific purposes, namely, chemical test solutions for checking the nephelometric turbidity calibration in photometers; chemical substances being preparations for scientific purposes in the form of secondary standards being standard solutions for checking photometers and turbidity measuring devices

'accuraci':26 'assur':5 'calibr':48 'check':23,44,68 'chemic':1,13,19,34,40,51 'devic':73 'extinct':30 'form':60 'linear':28 'measur':31,72 'medic':9 'name':18,39 'nephelometr':46 'photomet':33,50,69 'photometr':25 'prepar':14,35,54 'purpos':17,38,57 'qualiti':4 'reagent':2 'scientif':16,37,56 'secondari':62 'solut':21,42,66 'standard':63,65 'substanc':52 'test':20,41 'turbid':47,71 'use':12 'veterinari':11

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