Random Tumble Pilling Tester

Which liners do I require for each standard performed on Impulse?
Can I buy Impulse random tumble pilling tester liners from James Heal?
Are James Heal instrument liners ready to use?
On Impulse, why does air flow display OFF even though I have turned it on?
On Impulse, why is there a delay between starting the test and the air flow starting?