A three-dimensional measuring apparatus 1 projects slit light from a projector 7 onto a work 2 and a stereo camera 5 captures an image of the work projected by the slit light. More specifically, the tester includes a support, a holder for holding a bottle of cosmetic liquid, and controller for actuating a valve. A flow rate sensor is located in the sub-bypass passage for detecting the flow rate of air. A method for unclogging a toilet with a plunger device comprising the following steps: inserting a first end of a plunger device into an exit port of the toilet, expanding a flexible material attached to the first end of the plunger device to seal the exit port, and releasing a bolus of air into the exit port past the flexible material to unclog the toilet. It provides a flexible way to define, execute, and control user-specific, operator, and third party services combining various service capabilities. A method of reviewing surface of a wafer is disclosed.