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“Kalibrasi Sensor Mq-7 Dan Mq-136 Terhadap Sensor Ecom J2kn Pro Sebagai Alat Pengukur Gas Buang (Co Dan So2) Pada Proses Roasting Kopi: Sensor Calibration of MQ-7 and MQ-136 to Ecom J2kn Pro Sensor as Exhaust Gas Meter (CO and SO2) in Coffee Roasting Process”, st, vol. 2, no. 2, Jun. 2019, doi: 10.32734/st.v2i2.491.