The present invention relates to a state sensor which determines whether the products are suitable for use. By means of the inventive state sensor, il is determined whether or not the product in the package Is spoiled according Io the values such as temperature and moisture at which the product should be stored. Due to the fact that the temperature and tolerance values are recorded into the microprocessor (3), state of the product in the package is determined according to whether or not data received from the sensor (2,21) are within the range of tolerance values.
