Indiarto, Muhamad Arif, and Syamsudduha Syahrorini. “Hearing Reaction Time Measurement Concentration Level Tool Integrated Android Smartphone”. Procedia of Engineering and Life Science 1, no. 1 (February 5, 2021). Accessed November 21, 2024. https://pels.umsida.ac.id/index.php/PELS/article/view/643.