1. A vibration dosimeter for determining the daily vibration exposure of persons who are subjected to mechanical vibrations in their workplace by operating a tool, in particular a hand-guided power tool, characterized by means of a determination device ( 12 , 18 ) for determining the effective daily operating time of the tool ( 4 , 6 ), a calculating unit ( 22 ) for calculating a daily working time it takes to reach a prescribed vibration exposure action value and exposure limit value based on a vibration value typical of the tool and based on the action value and exposure limit value, as well as a comparing device ( 24 ) for comparing the determined effective daily operating time of the tool to the calculated daily working time it takes to reach the action value and the exposure limit value.