The Liquiphant M density meter from Endress+Hauser provides a direct on-line measurement of density and concentration, eliminating the need for expensive laboratory analysis. Its built-in density calculator can be end user customized with complex tables and mathematical interdependencies. Thanks to the on-line measurement the control system can take corrective actions immediately by performing closed-loop controls and react much faster to changing process conditions. For density calculation the device uses a mechanically oscillating fork with two tines that are each excited to resonant frequency. Changes in this resonant frequency are directly interrelated with the density of the medium.