Omron Wide Range Cuff (22cm-42cm) HEM-RML31Fits More Arms. Measures More Accurately. The Omron HEM RML31 Wide Range Cuff is designed for arms that standard cuffs can't accommodate covering a 22cm to 42cm circumference for a secure, accurate fit every time. Why It Matters An ill fitting cuff gives inaccurate readings. The HEM RML31 eliminates that risk with a wider range that suits most adults, including those with larger arms so you get blood pressure readings you can actually trust. Key