“ELECTROCARDIOGRAM (ECG) EQUIPMENT CALIBRATION TEST LABORATORY OF NURSES STIKES AL INSYIRAH NEW PEKANBARU”, AISCH, vol. 3, no. 1, pp. 80–91, Apr. 2023, Accessed: Jun. 04, 2026. [Online]. Available: https://jurnal.ikta.ac.id/aisch/article/view/2385