What size arm does the Blood Pressure Monitor fit? The Blood Pressure Monitor is made for adults with an arm circumference between 22 cm (9 in) and 42 cm (17 in). 関連記事 Can my health condition affect the results? How should I position myself to take a measurement? I'm having issues with heart rate and SpO2 measurements. What should I do? Installing my Wireless Blood Pressure Monitor Can my health condition affect the results? Didn't find what you need? Here's how to get in touch. お問い合わせ Call us Customer Support ID (this number allows secure and easy account verification when communicating with our support team by phone): To view your Customer Support ID, please log in by clicking on 'login' at the top of the page. Hours of Operation: North America: Monday through Friday, 9 am - 10 pm Eastern Time (6 am - 7 pm Pacific Time).If you are unable to reach us by phone, please use the ‘Send us an email’ button to send an email instead.Disclaimer:Free call and assistance. Calls placed from outside of these locations may be subject to long distance fees. All phone calls may be monitored and/or recorded for quality purposes.