The disclosure relates to a method for storing data for determination of a specific user's exposure to a danger factor caused by usage of an apparatus, the method comprising; assigning an apparatus key to the apparatus, the apparatus comprising a communication device for communication with a cellular wide range network and a communication device for short range communication with a wearable device; assigning a device key to the wearable device, the wearable device comprising a short range communication device for short range communication with the apparatus, wherein the wearable device is associated with a specific user; associating the apparatus key with the device key thereby establishing which user is presently associated with which apparatus; during operation of the apparatus: logging data pertaining to actual use of the apparatus; measuring a quantity of a physical entity and comparing the logged data and the measurement pertaining to the actual exposure with a predetermined allowable exposure; storing data pertaining to the logging, measuring or comparing together with the device key in a memory.
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