A multiple power supply connection memory that prohibits initialization until each power supply connection is powered up. The resistivity-measuring circuit C is one that calculates the resistivity of the liquid sample by detecting voltage generated between an outer electrode and an inner electrode, and between the outer electrode and the inner electrode, applies square wave AC voltage having an amplitude of 1 V to 42 V and a frequency of 0. During this process, a disk drive performance metric is monitored. At the receiving end, the acquisition signals are detected by correlation and subsequent accumulation. Thus, the electronic seal has a determined identification code so that the identification host can rapidly identify the article sealed by the electronic seal, and the sealed article is identified and managed easily and conveniently by provision of the electronic seal, thereby saving the manual work. This significantly induces wastage of radioactive foil.