1. Automation of Welding Fumes based on MQ-2 Sensor in Welding Laboratory (Otomatisasi Exhaust Asap Las Berbasis Sensor MQ-2 Pada Laboratorium Pengelasan) ; Bambang Adi Wahyudi, Duwi Leksono Edy, Wiyono wiyono. 2. Analysis of Do-it-Yourself (DIY) Electrode for Soil Resistivity Measurement Practical of Geology and Geophysics Subject at Earth and Outerspace Laboratory (Analisis Elektroda Do It…