The invention relates to an integrated test circuit in an integrated circuit for testing a plurality of internal voltages. Thus, the present invention provides a toner for electrophotography capable of providing well-balanced electrostatic property and fixing property during the image forming process in order to form images of high quality in a stable manner, and an image forming device. Each composite circuit element comprises an element controller, an element interface and a selected circuit element which may vary by element type, and which may be configurable. An optical pick-off includes a movable mirror, positioned to reflect the second beam received from the end of the second optical leg. With this structure, it is possible to prevent the clean box moved on the semiconductor wafer processing apparatus from colliding with the apparatus, even if the clean box manufactured by molding using a reinforced plastic in accordance with a prescribed standard includes a manufacturing error in its size.