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429	429	=== 2.6.1 Before measurement ===
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432	432	If the LSPH01 has more than 7 days not use or just clean the pH probe. User should put the probe inside pure water for more than 24 hours for activation. If no put in water, user need to put inside soil for more than 24 hours to ensure the measurement accuracy.
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437	437	=== 2.6.2 Measurement ===
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440	440	(% style="color:#4f81bd" %)**Measurement the soil surface:**
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442	442	[[image:1654592946732-634.png]]
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444	444	Choose the proper measuring position. Split the surface soil according to the measured deep.
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446	446	Put pure water, or rainwater to make the soil of measurement point to moist mud. Remove rocks or hard things.
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448	448	Slowly insert the probe to the measure point. Don’t use large force which will break the probe. Make sure not shake when inserting.
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450	450	Put soil over the probe after insert. And start to measure.
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453	453	(% style="color:#4f81bd" %)**Measurement inside soil:**
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455	455	Dig a hole with diameter > 20CM.
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457	457	Insert the probe inside, method like measure the surface.
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485	485	== 2.7 Calibration ==
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487	487	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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489	489	After stable, user can use below command to calibrate.
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491	491	[[image:image-20220607171149-4.png]]
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494	494	(% style="color:#037691" %)**Calibration Payload**
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496		-(% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)
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498	498	**Size**
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