Careful buyers look at the chromatogram, not only the purity number. One tall, clean peak with small neighbors supports a high purity figure. A report with a number but no chromatogram tells them less.
Chromatogram
The graph from an HPLC run, with each peak showing a separated part of the sample.
See it running on your own catalog
Purity does the work these terms describe: batches held until their lab report is in, payments matched to orders, and wording checked before it sends.