[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters

On the subject in the title: 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Working notes rather than a conclusion.

A follow-up question about 0.3 ml versus 0.5 ml that I did not know to ask the first time.

The earlier thread answered what I asked. What I should have asked is below, and I think it is the one that matters.

Post #11 and I disagree about the size of the effect, not about the direction.

Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.

The claim is narrower than it sounds, and deliberately so.

Thank you — that answers what I came here to find out.

Picking up post #42: that is the part I would want checked first.

One more thing on 0.3 ml versus 0.5 ml that took me far too long to see: the two figures people quote are not measuring the same quantity. Once you notice that, the apparent contradiction disappears.

Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.

I have no interest in any supplier named above.

U-100 means the barrel is graduated for a solution containing one hundred units of insulin per millilitre. For anything that is not insulin, the units are simply hundredths of a millilitre.

Noting that I have skin in this question and have tried to discount for it.

Small correction to my own earlier position on 0.3 ml versus 0.5 ml. I had the units the wrong way round, which changes the conclusion by an order of magnitude and therefore changes it entirely.

Sharps containers are a legal requirement for disposal in several jurisdictions and a sensible precaution everywhere. A rigid sealed container is the minimum.

Old habit: I write down the expected answer before I calculate it.