A new smart necklace capable of measuring several chemicals and concentrations in the wearer's sweat could change the lives of the some 400 million diabetics worldwide by eliminating the need for finger-pricking blood tests.The device features a clasp and pendant with the biochemical sensor on the back that when placed around the neck, captures glucose and serotonin levels.During a human trial, engineers from State University showed the smart necklace was able to measure a concentration of sodium, potassium, and hydrogen ions from the subject's sweat with up to 98.9 percent accuracy.
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