Home rehabilitation systems have already made their way into widely accepted medical practices, and their further diffusion will help limit healthcare-related costs and improve treatment conditions. For a therapy to successfully rely on a rehabilitation system, this should provide support that can be proven to meet treatment-specific purposes. This work deals with the validation of a home rehabilitation system designed to assist therapists in limb motor dysfunction treatment by providing joint angle measurements. The system under test has been compared with two commercial systems, commonly used in rehabilitation laboratories.