It is a chance for you to bring your meter and check it against known test samples. The Martin Lishman grain service team are on hand to advise on alterations or repairs that may be required to bring the meter up to standard.
If the meter is correctly calibrated than a certificate can be issued that can be used to satisfy quality assurance inspections. How much are the grain clinics? It is only £15 per meter and £5 per additional probe!