A sweat sensor device (200) with analytical assurance includes at least one sensor (220) for detecting a first analyte, and at least one calibration medium (270) containing at least the first analyte. When the first analyte in the at least one calibration medium (270) comes into contact with the at least one sensor (220), the calibration medium (270) provides a calibration of the at least one sensor (220). A sweat sensor device (200) may further include a carrier (240) having at least one aperture (220a) and a reservoir (254) for storing the at least one calibration medium (270). The at least one aperture (220a) provides fluidic access to the at least one sensor (220) from the reservoir (254).