An assembly of non-sterile portable electronic devices designed to perform an integrity test on the implantable portion of a cochlear implant (CI) system in situ; the test is intended to provide objective data on implant function and aid in the assessment of implant failure/fault modes. It typically includes hardware (e.g., biological signal amplifier, sound processor, coils, sign cables, magnets, leads) and software, with consumables (e.g., skin electrodes/gel, swabs/wipes, tapes), to provide implant stimulation to the patient and acquire skin surface potential waveforms from the patient. It is powered via a computer USB port. This is a multi-patient reusable device.