 Abstract stress can have a significant impact on one's cognitive abilities, behavior, and physiology. It has been difficult to accurately measure this type of stress due to the lack of reliable wearable sensors that can monitor sweat cortisol levels. This paper presents a new wearable sensor called microswet which is capable of collecting human sweat from different body locations and measuring cortisol levels. The collected data was used to analyze the relationship between cortisol levels and stress levels measured with the perceived stress scale, P.S.S. The results showed a strong correlation between cortisol levels and P.S.S. scores, indicating that microswet could be used to measure stress levels in personalized and clinical settings. This article was authored by Shageshayari, Rezy Salahandish, Asim Zair, and others.