Centralizer device for centre positioning of a bore hole component (90, 91) in a bore hole, said centralizer device prepared to have two possible different states, one locked state and one released state; said centralizer device comprising one outer sleeve comprising ribs and one inner sleeve, said inner sleeve being fastened to a bore hole component (90, 91); characterized in that: there is a lock spring, the lock spring being pre-tensioned so that it clings to a release spring; said release spring being pre-tensioned with an opposite tension dominating the tension of the lock spring; in the locked state of the centralizer device: the outer sleeve and the inner sleeve are locked to each other, so that longitudinal movement between the outer sleeve the inner sleeve is prevented, in that the lock spring is positioned both in an outer sleeve latch groove and in an inner sleeve latch groove; and the ribs are pre-tensioned with outward strain; said release spring being squeezed towards the inner sleeve by a snap ribbon; and in the released state of the centralizer device: the outer sleeve and the inner sleeve are released from each other, so that longitudinal movement between the outer sleeve and the inner sleeve is made possible in that the lock spring is positioned completely in the outer sleeve latch groove; resulting in said pre-tensioned ribs applying pressure against the wall of the bore hole; and said release spring being released and the lock spring as a consequence is positioned so that it is completely inside the outer sleeve latch groove, said snap ribbon having two different states related to the two states of the centralizer device, the locked and the released states, in the locked state of the snap ribbon, said snap ribbon comprising one or more snap-ribbon units connected to each other, said snap-ribbon unit comprising: a male snap-part; a female snap-part; and pH-soluble material positioned between the male snap-part and the female snap-part locking the male snap-part and the female snap-part together on a first end of the male snap-part and a first end of female snap-part, said pH-soluble material configured to getting dissolved in an environment having a specified pH-value, said snap ribbon, connected with an opposite end of a male snap-part joined to an opposite end of a female snap-part and deployed in the inner sleeve latch groove having a length squeezing said release spring towards the inner sleeve resulting in the lock spring locking the outer sleeve to the inner sleeve; and in the released state of the snap ribbon, said pH-soluble material positioned between the male snap-part and the female snap-part is dissolved and said interlocking is void and said squeezing of the release spring by the snap ribbon is void, resulting in the release spring being released and the lock spring being pressed inside the outer sleeve, the sleeves (10, 20) being released from each other enabling the ribs pushing against the bore hole wall and centralizing the centralizing device in the borehole, the transition from the locked state to the released state is configured to be initiated by subjecting the pH-soluble material to a pH value dissolving the pH-soluble material. the outer sleeve and the inner sleeve are locked to each other, so that longitudinal movement between the outer sleeve the inner sleeve is prevented, in that the lock spring is positioned both in an outer sleeve latch groove and in an inner sleeve latch groove; and the ribs are pre-tensioned with outward strain; said release spring being squeezed towards the inner sleeve by a snap ribbon; and the outer sleeve and the inner sleeve are released from each other, so that longitudinal movement between the outer sleeve and the inner sleeve is made possible in that the lock spring is positioned completely in the outer sleeve latch groove; resulting in said pre-tensioned ribs applying pressure against the wall of the bore hole; and said release spring being released and the lock spring as a consequence is positioned so that it is completely inside the outer sleeve latch groove, one or more snap-ribbon units connected to each other, said snap-ribbon unit comprising: a male snap-part; a female snap-part; and pH-soluble material positioned between the male snap-part and the female snap-part locking the male snap-part and the female snap-part together on a first end of the male snap-part and a first end of female snap-part, said pH-soluble material configured to getting dissolved in an environment having a specified pH-value, a male snap-part; a female snap-part; and pH-soluble material positioned between the male snap-part and the female snap-part locking the male snap-part and the female snap-part together on a first end of the male snap-part and a first end of female snap-part, said pH-soluble material configured to getting dissolved in an environment having a specified pH-value, said snap ribbon, connected with an opposite end of a male snap-part joined to an opposite end of a female snap-part and deployed in the inner sleeve latch groove having a length squeezing said release spring towards the inner sleeve resulting in the lock spring locking the outer sleeve to the inner sleeve; and