  Mini-EUSO is a compact telescope ($37 \times 37 \times 62$~cm$^3$) currently
hosted on board the International Space Station. Mini-EUSO is devoted primarily
to study Ultra High Energy Cosmic Rays (UHECR) above $10^{21}$~eV but also to
search for trange Quark Matter (SQM), to observe Transient Luminous Event (TLE)
in upper atmosphere, meteoroids, sea bioluminescence and space debris tracking.
Mini-EUSO consist of a main optical system, the Photo Detector Module (PDM),
sensitive to UV spectrum ($300\div400$~nm) and several ancillary sensors
comprising a visible ($400\div780$~nm) and NIR ($1500\div1600$~nm) cameras and
a $8 \times 8$ channels Multi-Pixel Photon Counter Silicon PhotoMultiplier
(MPPC SiPM) array which will increase the Tecnological Readyness Level of this
ultrafast imaging sensor. Mini-EUSO belongs to a novel set of missions
committed to evaluate, for the first time, the capability of observing Cosmic
Rays from a space-based. The instrumentation, space-qualified tests will be
shown.
