"JJF 1700-2018 Turbidimeter Type Evaluation Outline" is suitable for desktop and portable photoelectric Turbidimeters. Its display results are in formalhydrazine turbidity units or convertible to formalhydrazine turbidity units. Measurement principles include light transmission and different forms of light scattering, which are used to quantitatively measure the degree of scattering or attenuation of suspended particulate matter in transparent liquids. The outline details the components of the Turbidimeter, including Light source, collimation unit, sample measurement cell, measurement chamber, photoelectric detection element and display unit, and lists key components and materials. Cited documents include national standards for relevant Turbidimeters and environmental testing and ISO international standards to ensure compliance with the latest technical requirements.