Calibrate the air gaging system using the max and min
masters in a normal manner.
Orient the tool with a horizontal centerline so the jets are
situated vertical and located midway within the width of the
maximum setting master. This will produce a readout indication
at the high limit end of the tolerance zone on the scale. Note
the exact readout indication.
Reposition the air tool so that the nozzles are reversed 180
degrees. Observe any difference in the indicator reading from
step 1 above. Should a difference greater than one division on
the scale be encountered, the tool should be considered for
repair to correct "jet balance".
