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No - shave test is the one that really matters. The HHT can be useful if calibrated against a known shave - ready blade, but on its own it can be a deceptive test. Different hair will yield different...

Some guys find pre-shave oil to be helpful, but even better is to pay particular attention to your regular face prep. In the long run that will prove to be more benefit than a pre-shave oil or creme....