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Optical parameters and hysteresis behaviors play important role as useful diagnostic techniques in quality control for automotive liquids such as brake oils, engine oils and fuels. Refractive index and Brix properties at different concentrations (5 ppm up to 200 ppm) of standard reference chemical liquid solution (Fe(NO3)3) Nonahydrate were determined with an accuracy of ±10-5 using digital multi-wavelengths (refractometer DSR-λ). Practically, the refractive measurements of the selected standard solution have been investigated as a function of temperature (20 οC up to 50 οC) in the spectrum visible range 0.4-0.7 μm. With increasing both wavelengths and temperature the refractive index decreased monotonically. The refractive criteria are also increased with increasing concentration ratio. Moreover, the Brix of the solution have been studied as a function of temperature (20 οC up to 30 οC) with wavelengths in the same visible spectrum range.