This usually happens not just once in the product cycle, but with regular repeat tests on production devices - as an external quality assurance, so to speak. The knowledgeable user of measurement technology also knows, however, that accuracy is fleeting and has to be verified again and again.
In practice this means that measuring devices do not lose their level classification by design, but the specifications are constantly changing due to aging and environmental influences. Therefore, all manufacturers of measuring devices indicate periods in which the specifications are reliably met.
This period is typically twelve months for field measuring devices for LAN installations. After this time, the manufacturer should check the device for compliance with the measurement accuracy and readjust it if necessary.
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