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There are about 20 good reasons you need to make sure you have current calibration gas for use when calibrating and bump testing your gas monitor. But for the purposes of this post, we'll stick to the top two or three. Knowing the expiration of your calibration gas supply is more important than checking that gallon of milk that has been in your refrigerator for the past couple of weeks. Milk has more ways of letting you know it is no longer fit for breakfast. While milk might go s …