Chai khí chuẩn 50ppm H₂S/ 500ppm CO/ 2.5% CH₄/ 20.9% O₂/ N₂ Balance - Model 2AL
Chai khí chuẩn 50ppm H₂S/ 500ppm CO/ 2.5% CH₄/ 20.9% O₂/ N₂ Balance - Model 8AL
