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 2019, 2 (2). https://doi.org/10.32734/st.v2i2.491.