Our report presents the results of our investigations into the performance of prepared media with our SAS air samplers. We want to share our findings with the broader community in the hopes of promoting further investigations and understanding.

Cherwell has been undertaking servicing and calibration of our air sampling devices for over 35 years. During that time, we've seen devices used with many types of plated prepared media. The question that has nagged us is, "does the choice of plate affect the sampling result achieved?" We decided to investigate.

The report concludes that plate selection does make a difference and that compliance with the latest revision of Annex 1 will require organisations to ensure that their chosen plate, in combination with their chosen sampler, is giving an accurate result.

The testing from our investigation shows that results vary across plate brands, driven by the variation in size and form factor of the plates

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