USL Sp. z o.o. has expanded the offer with a new copper standard AR146.
This certified reference material is available in 1 g pins and has following parameters:
|AR146 Cu standard|
|% Oxygen||% Sulfur|
|Mean = 0.0235||Mean = 0.0014|
|Std. dev. = ± 0.0006||Std. dev. = ± 0.0002|
Other copper CRMs produced according ISO 17034 and ISO 17025 are also available: