NANOCONTROL

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