Article 41 1.

Tests, measurement or calculation methods referred to in Article 39 which are in conformity with harmonised standards or parts thereof the references of which have been published in the Official Journal of the European Union shall be presumed to be in conformity with the requirements set out in that Article and with test, measurement and calculation requirements set out in delegated acts adopted pursuant to Article 4 to the extent that those requirements are covered by such harmonised standards or parts thereof.