The emergence of personal and other low-cost health devices opened new perspectives for expanding and improving access to health care, with a potentially huge societal impact. We developed a modular and reconfigurable Health Kiosk based on such devices, where users can autonomously measure vital signs for screening or continued monitoring. However, achieving truly free use even by segments of the population less familiar with technology is a difficult challenge that involves identifying and solving all usability issues. We introduce the kiosk and present an assessment of its usability, including the tools developed, the results of the evaluation, the identified problems, and how we are solving those problems.