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Pens, vials & how to use a pen

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Test out: Pens, vials & how to use a pen

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1. Which number is most likely to come from a vial label?
2. Which number is a liquid volume?
3. For a manufactured pen, which instructions should control the device mechanics?
4. If two pens contain the same 3 mL volume but one has 10 mg and one has 40 mg, are they the same concentration?