Measuring apparatus and instruments, namely, spectroscopic or optical analysis systems for measuring one or more values of light, in the nature of the transmission, scattering, fluorescence and refraction values; measuring devices, electric, namely, spectroscopic and or optical analysis systems, especially used for the inline measurement of protein, fat and lactose or free fatty acids value or chemical oxygen demand in substances in the nature of milk products, frying oil or dairy wastewater;...