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Use this calibration gas:20ppm Hydrogen Sulfide60ppm Carbon Monoxide58% LEL Pentane (1.45% Volume Methane as a Simulant)15.0% OxygenNitrogen BalanceWant to calibrate the MSA Altair 4 or MSA Altair 4X? … read more

This is a question we get a lot, and I'm going to give the best answer I can think of:Because it sells calibration gas.The given theory is that setting a monitor to a Pentane curve makes it decently s … read more