All measuring devices should be regularly checked using a certified reference material. This is of special importance in a regulated environment like the pharmaceutical industry or in laboratories that work according to ISO 17025.For a density meter the density and the temperature should be controlled. This is done using a density standard and a certified thermometer. Reference liquids have to be very stable and of high purity and should be comparable to the real samples when it comes to their chemical and physical properties.A commonly used liquid is ultra-pure water with a density of 0.998 g/cm³, others are oil-based and have higher viscosities for instance. To check the linearity of results in a wide density range, standards come with densities between 0.7 and 1.5 g/cm³.Read the full text to learn about calibrations and adjustments of density meters according to ISO 17025. Trust is good, traceability is better!
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