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The durable and contoured Wide-Range D-Ring Cuff wide range cuff fits arms 9 in. to 17 in. in circumference. It's only compatible with Omron 3 and 5 Series Advanced-Accuracy models. Before you purchase a home blood pressure monitor, its important to determine the best cuff size for you. To determine your arm size, use a cloth measuring tape and measure the circumference of your left upper arm midway between your elbow and shoulder. Ensuring that the blood pressure cuff is neither too tight nor too loose will help ensure the most accurate readings providing you a more accurate picture of your hearts health.