Modern health services need efficient tools for measuring outcomes from interventions, that is, tools of proven efficacy which make minimal demands on the time of clinicians in learning to administer tests and in interpreting results. This paper describes an apparatus designed to meet those requirements. The apparatus administers performance tests of spatial listening for children and adults with unilateral and bilateral cochlear implants. The apparatus was designed with guidance from clinicians. It possesses three key attributes: it is simple to use; the results of tests are scored automatically and are compared with reference data; the apparatus generates comprehensive personalized reports for individual participants that can be included in clinical notes. This paper describes the apparatus and reports results of a test measuring spatial release from masking of speech which illustrates the compatibility between the new apparatus and an older apparatus with which the reference data were gathered.