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508	508	== 2.7 Calibration ==
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	510	+(((
510	510	User can do calibration for the probe. It is limited to use below pH buffer solution to calibrate: 4.00, 6.86, 9.18. When calibration, user need to clean the electrode and put the probe in the pH buffer solution to wait the value stable ( a new clean electrode might need max 24 hours to be stable).
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	514	+(((
512	512	After stable, user can use below command to calibrate.
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514	514	[[image:image-20220607171149-4.png]]
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517	517	(% style="color:#037691" %)**Calibration Payload**
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519		-(% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)
	523	+(% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:510px" %)
520	520	|(((
521	521	**Size**
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601	601	* Check what sub-band the LoRaWAN server ask from the OTAA Join Accept message and switch to that sub-band
602	602	* Use the Join successful sub-band if the server doesn’t include sub-band info in the OTAA Join Accept message ( TTN v2 doesn't include)
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	608	+
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	610	+
604	604	=== 2.8.3 CN470-510 (CN470) ===
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606	606	Used in China, Default use CHE=1