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533
c/coldchain·posted 8 days ago by u/certified_reference

£18 USB logger settled a three-week argument in thirty seconds

PSA Clean Column ×2

Trying to settle this properly because the thread from last year went in circles.

The claim: stability matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 9 months without either producing anything.

What would actually settle it is 23 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

4,606 up / 4,073 down53% upvoted24 commentsid 1moq5a21 Jul 2026

24 comments

22 in this archive, depth 4

best — the order this archive was captured in

u/aleksi_eriksen61 points·8 days ago

data logger is the standard, gut feeling is not

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u/curious_panel_only36 points·8 days ago

data logger is the standard, gut feeling is not

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/certified_referenceOPQC22 points·7 days ago

That is net peptide content, not purity. Different number, different meaning.

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u/dario_bakken16 points·7 days ago

no tracking numbers, no full addresses, no label photos — instant removal

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u/certified_referenceOPQC12 points·7 days ago

That is net peptide content, not purity. Different number, different meaning.

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u/ilias_steiner47 points·8 days ago

excursion claims need a logger trace or a photo at unboxing, not "it felt warm"

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u/cato_batista45 points·7 days ago

Not convinced. The evidence does not support that reading.

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u/bence_ibarra35 points·7 days ago

time-at-temperature integral is the dose, not just peak temperature

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[removed]33 points·7 days ago

[removed by moderator]

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u/meera_sandvik30 points·7 days ago·edited

Not convinced.

Yes, exactly this, and it is the bit that took me 69 weeks to accept.

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u/nayeli_iyer20 points·7 days ago

stability after excursion is not zero, it is dose-dependent

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u/preservative_free_p16 points·7 days ago

time-at-temperature integral is the dose, not just peak temperature

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u/curious_panel_only-4 points·8 days ago

Customs clearance took 16 days. Package sat unrefrigerated during that. Powder tested clean after, reconstituted solution probably would not have.

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u/certified_referenceOPQC1 point·8 days ago

Not to be pedantic but ice pack and lyophilised are being used interchangeably and they are not interchangeable in real life.

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u/hplc_hobbyistruns their own column1 point·7 days ago

time-at-temperature integral is the dose, not just peak temperature

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u/adaeze_weiss1 point·7 days ago

I am going to push back on this slightly.

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u/ilias_steiner1 point·7 days ago

Denmark to Denmark takes 16 days on average, variance is 24 days

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u/usb_logger_ursula1 point·7 days ago

You have restated the marketing copy. What is the actual substance here.

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u/reship_roulette1 point·7 days ago·edited

France to France takes 4 days on average, variance is 30 days

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About c/coldchain

Temperature and stability in the real world: what an excursion actually costs you, why lyophilised powder is far more forgiving than reconstituted solution, how to read a logger CSV, and how to photograph a failed shipment so the conversation with the vendor is short.

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c/coldchain rules
  1. Excursion claims need a logger trace or a photo taken at unboxing. "It felt warm" is not data.
  2. No tracking numbers, ever. They identify you and the recipient.
  3. Stability claims need a source or an explicit "this is my guess" label.
  4. Independent community. Nobody here sells anything, and anyone who tries is banned.
  5. Not medical advice. Describe what you did; never prescribe to a stranger.
  6. Claims need evidence. Batch numbers, dated screenshots, independent test reports, or a citation.
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  8. No contact handles, wallet addresses or tracking numbers — they identify people.
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