A carrier for use in a two-component developer for developing an electrostatic latent image is provided. Several resistance temperature detectors are spaced in an electrical circuit which is then protected in the outer armour layer. The inorganic particles respond to a stimulus, preferably by generating heat. Further, the spray gun end is adapted for releasable engagement with a liquid inlet port of the spray gun and the lid end is adapted for releasable engagement with the liquid outlet. The processor may also be configured to receive second data from the image sensor in the second state, and output at least one of a message and a command associated with the second data. The shaft support part has a knob portion disposed astride the opening.