FDA inspectors don’t just check your records. They bring their own thermometer.

And when their reading doesn’t match six months of logged data from the sensor on your cold room wall, the honest explanation is one nobody wants to say: The monitoring system was compliant; the measurement just wasn’t accurate anymore.

I know because I’ve been in that room.

Working across pharma cold chains and GMP storage facilities in India, I’ve seen this scenario play out more than once—a fully connected, cloud-logged, 21 CFR Part 11-compliant monitoring system sitting confidently on a dashboard while the actual cold room temperature tells a different story. The system isn’t broken; the data are wrong. And the gap between those two things is what this article is about.

Two promises. One assumption.

A 21 CFR Part 11-compliant data logger makes exactly one promise: The data it captures will be tamper-proof, time-stamped, and audit-ready. That’s a data integrity commitment. A good one.

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