[en] Existing borehole pressuremeters and jacks have been reviewed for suitability in light of the requirements for testing to depths of 350 metres in hard clays and soft rocks to provide geotechnical information for repository design. Since no currently available device is suitable for immediate use in this application, recommendations have been made for the development work necessary to achieve a satisfactory pressuremeter instrument. Drilling and instrument insertion procedures have also been reviewed and it has been concluded that a wireline system is the most appropriate. Development costs are detailed for the provision of a prototype high pressure pressuremeter testing package. (author)