A portable electronic device designed to perform an integrity test on the implantable portion of a hearing implant [e.g., cochlear implant (CI)] system in situ postoperatively (e.g., during routine checks); the test is intended to provide objective data on implant function and aid in the assessment of implant failure/fault modes. It typically consists of hardware (e.g., biological signal amplifier, sound processor, coils, sign cables, magnets, leads) and software, and possibly includes 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. This is a reusable device.