The Micro Rain Radar MRR at 24 GHz is a meteorological radar profiler for Doppler spectra of hydrometeors in height ranges 15 m – 6000 m. The system allows precise measurements of the Doppler spectra caused by hydrometeors and yields the rain rate, liquid water content and drop size distribution for the liquid phase. All computations including automatic melting zone detection are integrated in the outdoor electronics.