Gentaur Buffer Standard pH 9.21 at 25°C Technical Colour Coded ISO 17034 Certified Reference Material - 500ml
https://www.e-photosynthesis.org/shop/fm-07-crmtb921-gentaur-buffer-standard-ph-9-21-at-25degc-technical-colour-coded-iso-17034-certified-reference-material-500ml-26463
https://www.e-photosynthesis.org/web/image/product.template/26463/image_1920?unique=89b0bed
Technical grade buffer at pH 9.21, certified and colour coded for lab calibration.
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