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This guide walks you through proper application of the FreeStyle Libre sensor on the upper arm. It emphasizes choosing a flat, clean site—avoiding tattoos, scars, or recent injection spots—then thoroughly cleaning, drying, and applying the skin prep. After aligning the applicator correctly and pressing firmly, you’ll hear a click; the sensor becomes active after a one-hour warm-up. It’s factory-calibrated—no finger pricks are needed unless readings don’t match symptoms.
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