We have now developed version 3 of the Sudologger, our instrument for measuring sweat activity. This is a small, battery-powered instrument for measuring thermal and psychological sweat activity at four different skin sites simultaneously. It also measures ECG and Heart Rate Variability (HRV) is calculated by the software. In addition, the instruments contains accelerometers and gyroscope. The instrument has a wireless connection to a computer / laptop and we provide a user-friendly software package to control the instrument, display the measured data and to perform data analysis on the data.