| 摘要 |
This method consists in blocking, in a position of magnetic instability, and with respect to at least one fixed magnet 5, a pivoting magnet 6 provided with faces marked differently, for example using colours visible one by one, this blocking being brought about by means 11 which, melting at a temperature whose value is substantially equal to that of the preservation threshold of the product whose preservation is to be ensured, are placed in a blocking state in a priming phase. Application to monitoring the temperature of frozen products. <IMAGE>
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