The invention concerns a tunable filter comprising an optical fiber incorporating a Bragg grating on a portion of the fiber. The drill bit includes a bit body having a bit face disposed on an axial end portion thereof. In the disclosure, transmitting identification information of the data to share for data sharing may be performed anytime and anywhere as long as a connection with the server has been established, without the need of establishing a Bluetooth or other connections between the terminals or the need of installing any communication applications. The EBL has a melting temperature that is higher than the melting temperature of the brazing material. With such an arrangement, refilling of the measuring articles to the measuring instrument becomes easy, and the measuring instrument can be always loaded suitably with a quantity of the measuring articles. The present invention also breaks a SOAP message without using DOM by acquiring header information with parsing a received SOAP message and sequentially performing decode or verification of a signature of a body part according to the header information.