In the above definition the words “placed on the market and/or put into service” should be applied to describe different situations as follows: - “placed on the market”: should be used in the case when all the relevant conformity assessment procedures are finalized before a measuring instrument or prepackage is put into service; - “placed on the market and put into service”: one or more conformity assessment procedure(s) may be or have to be carried out when a measuring instrument is put into service; - “put into service”: to describe the situation when a manufacturer manufactures a measuring instrument to be used by itself (it is not necessary to place it on the market).