Graphical user interface design for a calibration device for infrared tympanic thermometers

This study presents the development of a laboratory calibration device for infrared tympanic thermometers (ITTs), incorporating a high-stability gray-body cavity as an approximation to a blackbody radiation source. Particular emphasis is placed on the design of a graphical user interface (GUI) developed under a user-centered design framework. The interface was iteratively refined through field observations, usability testing, and direct collaboration with healthcare professionals and calibration technicians. The GUI structures the calibration process into four sequential phases - selection, warm-up, calibration, and cooling - using color coding, animated feedback, and high-resolution temperature controls with a minimum resolution of 0.01 °C. Usability evaluations demonstrated high levels of intuitive interaction, reduced cognitive load, and efficient task execution. The visual design contributed to safe operation by clearly communicating system status and preventing common user errors. This work introduces an innovative interface approach within the field of medical metrology and proposes transferable design principles applicable to other precision calibration instruments. The results highlight the importance of integrating human–machine interaction design with metrological rigor to improve transparency, efficiency, and safety in both laboratory and clinical environments.