Raynaud's Disease Monitor (IMAGE) Johns Hopkins University Caption The underside of a prototype Ambulatory Raynaud's Monitor, approximately 9/16 of an inch in length, is shown on top of a Band-Aid, which is often used to secure the monitor to a patient's finger. The two black dots are temperature sensors. The green dot helps a patient correctly orient the device when placing it into its carrying case when not in use. Credit Credit: Johns Hopkins University Applied Physics Laboratory Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.