User Friendly Molecular Weight Analyzer is simple to use and is illuminated by a temperature stabilized, precision power controlled diode laser. The Analyzer has the feature of high-sensitivity and low-noise CCD detector automatically collects the scattered light. The Analyzer is designed in such a manner that the software extrapolates the data to zero angles for the absolute molecular weight determination. The User Friendly Molecular Weight Analyzer can study protein aggregation, oligomerization and complex formation.