CHAI KHÍ CHUẨN 25 ppm H2S/ 100 ppm CO/ 2.5% CH4/ 18% O2/ N2 Balance – Model 2AL
CHAI KHÍ CHUẨN 25 ppm H2S/ 100 ppm CO/ 2.5% CH4/ 18% O2/ N2 Balance – Model 8AL
