The set-up for investigations of hydrogen capacity of materials has been created. It completely meets the modern requirements for the experimental equipment of this class. The set-up design makes it possible to investigate hydrogen-sorption characteristics of different materials with low specific density, including nanocarbon structures and composites on their basis, by the volumetric method in the pressure range between 0.01 and 16 MPa H₂ and at temperatures from 77 K to 1273 K. It is equipped with a metal-hydride unit for hydrogen storage/compression. The design and service conditions of this device are discussed.