Since each of acoustic sensors (11-15) resonates with a different sound, a data collection/transmission circuit (30) detects only a sound in a different frequency band in the entire band and data conversion circuits (21-25) convert it into data. A control unit (31) transmits the data from a data transmission circuit (32) via an antenna (33). A data reception/analysis diagnosis circuit (40) receives data corresponding to the acoustic sensors (11-15) and compares a sound pressure stored in advance to a sound pressure obtained by the received data so as to determine whether the measurement object is normal.
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