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Ask ten safety managers what the difference between a bump test and a calibration is, and you'll get at least three wrong answers. This isn't a trivia question — mixing these up is how gas monitors drift out of adjustment and fail in the field without anyone realizing it. In refineries, utilities, water/wastewater plants, and construction, a gas detector you can't trust is worse than no detector at all, because it gives people a false reason to feel safe. The short answer: a bump test is a …