Gentaur pH 6.881 NIST Value Buffer Solution at 20°C in Bag-in-Box - 5l
https://www.bioguid.info/shop/fm-07-bph99-gentaur-ph-6-881-nist-value-buffer-solution-at-20degc-in-bag-in-box-5l-8465
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5L NIST certified pH 6.88 buffer, bag-in-box packaging, perfect for repeated calibration at 20°C.
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