We present the two spectrometers which are (or soon will be) installed on the new 2.3 m ARISTARCHOS telescope in Greece. The Aristarchos Transient Spectrometer (ATS), is a new low-medium resolution spectrometer, that has been developed in order to study relatively bright but transient phenomena like the variability of cataclysmic variables stars, Active Galactic Nuclei, Symbiotic stars, the optical flashes of Gamma-Ray bursts and Novae etc. Its installation has been completed and first light spectra are presented. The Manchester Echelle Spectrometer (MES-AT) is a very well known instrument already used successfully at different astronomical sites (i.e. Anglo-Australian, La Palma and San Pedro Martir observatories). This high resolution spectrometer is dedicated to the investigation of extended line-emission phenomena (supernova remnants, planetary nebulae, H{\sc ii} regions, luminous blue variable star's nebulae etc.). After its upgrade with the installtion of a new arc lamp system is going to be installed on the telescope with the completion of this procedure to be close to the end of September 2007.