A	C176677	PQ/CMC Units of Measure Terminology	C207698	Nephelometric Turbidity Unit	The reference unit used to measure the turbidity of a fluid or the presence of suspended particles in water.	[NTU]	Nephelometric Turbidity Unit	
A	C176677	PQ/CMC Units of Measure Terminology	C207699	Formazin Nephelometric Unit	A unit of measure of turbidity in which the FNU is measured with an infrared light source in accordance with the ISO 7027 method.	[FNU]	Formazin Nephelometric Unit	
A	C176677	PQ/CMC Units of Measure Terminology	C207700	Jackson Turbidity Unit	An obsolete unit measuring the clarity of water in which one views the flame of a candle through a vertical tube of the water to be measured.	[JTU]	Jackson Turbidity Unit