A scan flip-flop circuit including a data input, a scan input, a data output, a flip-flop, a multiplexer and a delay element is provided. The rotation sensor has rotation guides for guiding rotation of the first and second rotors respectively with respect to the fixed core. The first monomer includes four hydrogen atoms to bond with the carbon chain, and the second monomer includes at least one fluorine atom and at least one non-fluorine halogen atom. The handle is an elongated member having a top end and a bottom end, with a generally rectangular cross-section at the top end and a generally circular cross-section at the bottom end. The length of the control signals is limited in both directions.