Very Good to Excellent: Cylinders will gauge better with the gauge visably portruding from cylinder.
Good: Gas Cylinder will pass gauge test with being at least Flush on Gauge
Out of Spec: These cylinders let gauge seat below flush line. These are functional and will work fine, just won't produce super accuracy as they will bleed gas, reducing system efficiency. These are good candidates for boring out and using oversize piston to make them Good as New.