Magruder Contacts

Purchasing Quality Reference (QRM) Materials

QRM Request Form (pdf)
Cost is $50.00 per sample. Shipping cost will be added to samples shipped outside of the US.
Fill out and follow instructions on the QRM Request Form above.

Available samples are listed in the excel files below.

All QRMs (xlsx)
N scheme QRMs (xlsx)
P scheme QRMs (xlsx)
K scheme QRMs (xlsx)

NOTE: Some concentrations in the excel files may be misleading if only a small number of labs reported values. For more accurate values, click on the COA in the files which shows results with 16 or more labs reporting.