The paper presents a computer program developed for the purpose of objectivisation of children hand dexterity. The program is composed of 6 subtests checking the control of the upper limb joints and the fine finger dexterity needed for mouse control. Measurements have been performed for a sample of 285 children aged from 7 to 15. Clinical standards for particular age groups have been proposed and statistical significance of differences among the corresponding mean values has been shown. A strong correlation of the hand control and age of the subjects has been found.