Lifesource Large Blood Pressure Arm Cuff UA-281 The Lifesouce large adult blood pressure arm cuff UA-281 is comfortable and easy to use. The arm cuff has a strong velcro hook and loop fastener that is tested for up to 30,000 uses. Note No Blood Pressure Monitor is Included This is only a cuff. Fits Single Tube Manual and Digital LifeSource Blood Pressure Monitors. Fits Arms 11.8 to 17.7 Inches in Circumference 30-45 cm The UA-281 cuff can be used on all single tube automatic blood pressure machines manufactured by AND Medical. Note Follow instructions in manual or phone customer service at LifeSource to learn how to modify the exhaust and guarantee accurate measurements. Using the correct size cuff is important for an accurate reading. A cuff that is too large will produce a reading that is lower than the correct blood pressure; a cuff that is too small yields a measurement that is higher. With your arm hanging at the side of your body, measure the circumference of your upper armat the midpoint between the shoulder and elbow. UA-279 Small Arm Size fits 5.1 7.9 in. 13 20 cm UA-280 Medium Arm Size fits 7.5 12.2 in. 19 31 cm UA-281 Large Arm Size fits 11.8 17.7 in. 30 45 cm For use only with Lifesource manual or digital blood pressure monitors that have a single tube. All sales on cuffs are final. No refunds or exchanges. Lifetime Manufacturer's Warranty. This item ships from a separate warehouse and may require extra time for delivery.