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How Often Should Gas Detectors Be Calibrated? OSHA, Manufacturer & Best Practices If you use gas detectors to keep your people safe, calibration isn't optional — it's the difference between a detector you can trust and one that's just making noise. But "how often" is where most people get confused, because OSHA, MSHA, and the manufacturers don't all say the exact same thing. Here's the straight answer, plus what we recommend based on what we see every day at CPS Calibrations. The Short …