Associate Members – Designated Institutes

Country	NMI	DI	Quantity
Argentina	INTI	National Commission of Atomic Energy (CNEA)	Ionizing radiation
Brazil	INMETRO	Laboratório Nacional de Metrologia das Radiações Ionizantes, IRD (LNMRI/IRD)	Ionizing radiation
Brazil	INMETRO	Observatório Nacional/Serviço Nacional da Hora (ON/DSHO)	Time and Frecquency
Mexico	CENAM	Instituto nacional de ecología y cambio climático (INECC)	Ozono concentration in ambient air
Mexico	CENAM	Instituto Nacional de Investigaciones Nucleares (ININ)	Ionizing radiation
Uruguay	LATU	Administración Nacional de Usinas y Transmisiones Eléctricas (UTE), Montevideo	Electricity and Magnetism.
Costa Rica	LCM	Instituto Costarricense de Electricidad (ICE), Laboratorio Metrológico de Variables Eléctricas (LMVE) (ICE-LMVE)	Magnetism, Time & Frequency
		Laboratorio de Metrologia, Instituto Costarricense de Electricidad (LAMETRO-ICE)	Photometry and Radiometry, Fibre Optics, Wavelength and Length
		Laboratorio de Fuerza del Laboratorio Nacional de Materiales y Modelos Estructurales (LanammeUCR)	Force
		Laboratorio Nacional de Metrología, Grandes Masas y Volúmenes (RECOPE)	Mass from 50 kg to 1000 kg
USA	NIST	Naval Undersea Warfare Center, Underwater Sound Reference Division (NUWC-USRD)	Sound in water
International		IAEA	Ionizing radiation
Canada	NRC	Transcanada	Flow
Saint Lucia	SLBS	National Agricultural Diagnostic Facility (NADF)	Chemical Metrology
Colombia	INM	CALAIRE- UN	Chemical Metrology
Ecuador	INEN	CMEE- Ecuador	Time and Frecquency
Costa Rica	LCM	CICANUM – Costa Rica	Ionizing radiation