Eleven Calibrated NIST Traceable ASME Nozzles here of various sizes (0.5", 1", 2" 5") can added up to select ranges for EFA rig calibration at pressures of 1 to 5 inches Water column by removing the O-ring sealed caps from the nozzles. In most cases, an entire EFA rig can calibrated by this single array from 0.5 to 40 Sq. Inch Effective Area Each of these ASME nozzles have been measured multiple times from a NIST traceable absolute Sonic Nozzle based flow rig. These can also be used in place of Orifice Plates. 

Custom diameter selections are also available, tell us what sizes you require and we'll take care of the rest!