NovoPen 3 PenMate Instruction Manual
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FDA revision #4 (final)
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19 Push the yellow push button and the needle should appear.
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You should now be able to see the needle and the control line.
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If you cannot see the needle, do not use the NovoPen 3 PenMate. Never use the
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NovoPen 3 PenMate unless you are sure that it is working properly.