Used to check the calibration each nozzle size. There is one test plate size available for each nozzle size. Test Plates or Calibration Plates as some call them are an essential accessory for troubleshooting any calibration related problems with the Air Permeability Tester. A user can not recalibrate the permeability tester with the test plate but the test plate will indicate whether the instrument is performing within the calibration spec.
3 1/4" dia brass disk with a rubber gasket on one side and a set of holes in the center. Number and size of holes depend upon the size of the nozzle that it is used with.
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