CHAI KHÍ CHUẨN 10 ppm H2S/ 50 ppm CO/ 2.5% CH4/ 18% O2/ N2 Balance – Model 2AL
CHAI KHÍ CHUẨN 10 ppm H2S/ 50 ppm CO/ 2.5% CH4/ 18% O2/ N2 Balance – Model 8AL
