Gentaur Buffer Standard pH 4.00 at 25°C Colour Coded ISO 17034 Certified Reference Material - 500ml
https://www.gcat-seek.org/shop/fm-07-crm1040525c-gentaur-buffer-standard-ph-4-00-at-25degc-colour-coded-iso-17034-certified-reference-material-500ml-8350
https://www.gcat-seek.org/web/image/product.template/8350/image_1920?unique=19a23d2
Same as above but with colour coding for easy identification; smaller volume. Certified for precise pH calibration at pH 4.00 and 25°C.
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