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Measuring blood pressure is a key part of vital signs, and it relies on a cuff. The cuff wraps around the upper arm and inflates to compress the brachial artery, then deflates while the monitor (or clinician) detects the pressure at which blood flow returns. That process yields systolic and diastolic values, so the cuff is the essential component for obtaining this vital sign. Proper sizing and placement are crucial—use the correct circumference, position the cuff at heart level with the arm supported, and ensure no clothing distorts the fit—for accurate readings. The other items don’t serve this measurement: a syringe is used for injections, an oxygen cylinder provides therapy, and a stethoscope does the auscultation but doesn’t involve an inflatable cuff for measuring blood pressure.