Rotilabo® pH buffer solutions, pH 4,01, in bags, 20 unit(s)Rotilabo pH buffer solutions, pH 4,01, in bags, Density (D) ~1 g cm, Boiling point (bp) 100 C The quantity of reagent contained in a sachet (25 ml) is sufficient for a single calibration. Traceable thanks to comparison with standard references from the National Institute of Standards and Technology (NIST) and the National Metrology Institute of Germany (PTB) With certificate of analysis for documenting the quality, traceability and accuracy Technical