A magnetic revolution counter for the unambiguous determination of a definable number of revolutions of a rotating element to be determined. The compositions, coated substrates and methods find particular applicability in the manufacture of semiconductor devices. Subsequently, the sentinel lymph node is extracted. , which can be used to verify the authenticity of the tag when verifying the signature. The main body portion is arranged to be removable and reattachable to the luggage rack bar. The semiconductor optical converter comprises an n-InP clad layer, an optical waveguide layer, an SI-InP clad layer, and an n-InP clad layer formed sequentially on an SI-InP substrate, characterized in that a voltage is applied from an electrode connected with the n-InP clad layer and a ground electrode connected with the n-InP clad layer.