声明：本说明书著作权归杭州睿登科技有限公司所有，未经允许任何单位或个人不得用于商业用途。
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During the firmware upgrade process, the interface is displayed as follows:
4.3.3 Calibration
The calibration fine-tuning function needs to be operated by a professional
electronic person who has more than five and a half multimeter. It will change the
system setting, incorrect operation may exceeds the hardware limit and cause
damage, and the resulting damage is not covered by the warranty! The limit error of
the product is generally much smaller than the nominal error, when the error is close
to or even higher than the nominal error, you need to check if the measuring
instrument is accurate.
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