toote üleandmiskohal võetud proov, mille korral toote kvaliteedi eest vastutus läheb tarnijalt üle vastuvõtjale, sample taken at the place where the product is exchanged, i.e. where the responsibility for the product quality passes from the supplier to the recipient, assignment of a different number to each sample so that no other identification or information on any sample is given to the operator, proov, mis võetakse proovivõtja poolt omaniku nõudel ja samade nõuete kohaselt kui koondproov ja mis jääb omaniku käsutusse, material or substance, one or more of whose property values are sufficiently homogeneous and well established to be used for the calibration of an apparatus, the assessment of a measurement method, or for assigning values to materials