An insulating ceramic compact is provided which can be obtained by low-temperature firing, has a low relative dielectric constant and superior high frequency characteristics, and can be co-sintered with a material having a high coefficient of thermal expansion. The clamp-on-type ultrasonic concentration metering system includes an ultrasonic sensor portion and a concentration meter. The apparatus can include a media sheet rub module configured to rub a rub material against the first side of the media sheet. Then, a keyword recognition unit detects a match or association between one of the keywords and information input to an input unit or output from an output unit in the terminal.