Also, the International Organization for Standardization (ISO), the United States Environmental Protection Agency (EPA) and National Institute of Standards and Technology (NIST) each have more than one definition of standard reference conditions in their various standards and regulations.
Ayrıca, ISO (International Organization for Standardization), EPA (Amerika Birleşik Devletleri Çevre Koruma Ajansı) ve NIST çeşitli standartları ve ayarları için birden fazla standart referans koşulları vardır.