Monitor on volunteers arm (IMAGE) Washington State University Caption The health monitor measures sweat on a volunteer's arm. As part of the prototype testing, the sweat was dyed red. The blue patch was used for laboratory comparison. Credit Washington State University Usage Restrictions for use with stories associated with this press release License Original 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.