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With your arm hanging at the side of your body, measure the circumference of your upper arm at the midpoint between shoulder and elbow. ARM SIZE RECOMMENDED CUFF SIZE REPLACEMENT CUFF MODEL# 5.1” - 7.9” (13-20cm) Small UA-279 7.5” - 12.2” (19-31cm) Medium UA-280 11.8” - 17.7” (30-45cm) Large UA-281 BULB HOSE CUFF HOSE MONITOR PRESSURE AND PULSE DISPLAY AIR SOCKET SYSTOLIC DIASTOLIC (PULSE) POWER DIGITAL BLOOD PRESSURE MONITOR MEASURING PRESS EXHAUST RE-MEASURE BATTERY LOW RE-MEASURE POWER BUTTON