Eltvor Instruments, s.r.o. focuses on research, development and production of instruments in the fields of photonics and time and frequency metrology. The experience of Eltvor core team encompasses works on: positioning, laser ranging, optical interferometry, atomic clocks, sub-ppm optical wavelength measurement, sub-mK thermal control, satellite geodesy and navigation systems. Our current developments include: a laser Doppler instrument intended for industrial metrology, a simple, multichannel time event meter, and recently also a custom design of COTS-based Earth-observation camera for a small CubeSat mission.