[PSA] below spec is not what most of this community thinks it is
Short public-service post: below spec is not what most of this community thinks it is. Sent a vial in specifically to check a supplier’s claim after a good experience. It matched. Boring result, worth logging. Tested three lots over a year rather than three vials from one lot. Cost the same and told me something…
Push back: three tests on one lot is one lot. It tells you about that lot and almost nothing about the next one.
split a vial across two services once and you will never argue about ground truth again
the trend across lots is worth more than any single figure
Did the vial lot match the paperwork lot?
Do you have the trace, or only the summary?
Careful with the trend claim. Four results over two years is a very sparse series to draw a line through.
That service reports area percent by default. Worth stating, since the thread has been comparing it to a mass figure.
Small fix — same supplier, different lot. The two rows in the log are not the same batch.