M. A. A. Azmin and M. A. H. Mohd Adib, “Consistency Data of Peak Expiration Flow, SpO2 Level and Heart Rate Measurement using Spirometer Volume (SpiroLuME) Device”, TWIST, vol. 18, no. 4, pp. 317–322, Dec. 2023, Accessed: Nov. 16, 2024. [Online]. Available: https://twistjournal.net/twist/article/view/68