An apparatus comprising a housing having a port adapted to receive a moveable first member and a moveable second member is configured to communicate with a tube. The present invention also relates to a pn heterojunction utilizing the photosensitive organic semiconductor compositions. Further by eliminating influence of the inertial force of the measurement stylus, a measurement error is corrected to obtain a correct measuring force, and high precision measurement can be executed. In the second planarization module, the exposed portion of the barrier layer is removed from the surface. The chamber may be spherical to deliver consistent powder perturbation at all mixing chamber orientations.