Apply the arm cuff
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Insert the air plug into the air jack securely until clicks.
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Apply the arm cuff onto your left upper arm.
The tube side of the arm cuff should be 0.5 inches above the inside elbow.
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Wrap the cuff securely.
Make sure that the air tube is on the inside of your arm.
https://manuals.plus/omron/bp7450-10-series-upper-arm-blood-pressure-monitor-manual#ixzz7thHpn7n9