They are used to calibrate and test industrial gauges or for precision measuremets in the laboratory; they can be used for both liquid and gaseous fluids, except for those having a high viscosity or prone to crystallisation. Each gauges is supplied with a calibration certificate issued by our lab, indicating the global error of the gauge and the references to the primary gauge use for the calibration. Nominal diameters (DN) 100, 150, 200, 250 mm. Accuracy class 0.25 (0.6 for Ø 100 and for scales from 60 to 400 mbar) according to EN 837-1.