Automatic Helium Leak Testing Machine Built for Flexible Custom Fixture Design Automatic Helium Leak Testing Machine with Custom Fixture Design A good leak test is only as good as the fixture that holds the part. If the fixture does not seat the workpiece the same way every time, the result is not repeatable, and the operator spends more time adjusting than testing. HongCe designs the HC-HLT-F4 around the fixture, because that is where most field problems begin. Fixtures