A pre-series is a small order, that is, a small batch of electronic boards. The usefulness of this service offered by MEC to its partners is very strategic. Thanks to the production of a pre-series of electronic boards, also known as batch zero, the customer has not one but a series of samples of electronic boards on which tests and checks can be performed for the final production set-up. As in the case of mere sampling, so the pre-series has the advantage of quality and production optimization. Also for this service, MEC offers advice and experience of its technical office to support the study and the definition of the performing changes to be made to the boards before the final production.