We have a limited supply of samples previously analysed in our proficiency testing challenges. These samples can be used to assess your own calibration or control material. The samples are available for purchase and are supplied with details of their nominal value, together with the descriptive statistics for each method published by the proficiency testing scheme. Subject to availability, you can choose any sample circulated in the past 12 months.

The costs are, per 1mL:

GBP10.00
€14.50
US$20.00

To this cost must be added packaging and and surface/Air Mail postage at the following rates:

UK GBP4.00
Europe €12.00 or GBP8.00
Rest of the World US$20.00 or GBP10.00

Courier shipment is available on request at a cost of:

Europe €70.00 or GBP50.00
Rest of the World US$120.00 or GBP60.00