Gamma-Radiation Micro spectrometer μSPEC is a very compact high performance device with changeable CdZnTe detection modules. The μSPEC is based on application of high-sensitivity room temperature operating CdZnTe semiconductor detectors and miniature multi channel analyser MikroMCA527 (GBS Elektronik GmbH). The μSPEC allows measurements of gamma-radiation spectra and storing it for processing in a PC via USB port. The changeable detection modules contain the high quality CdZnTe quasi-hemispherical detector of volume 60 mm3, 500 mm3 or 1500 mm3.