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| | [[File:Red pH meter reads 4.96.jpg|thumb|pH meter in water.]] |
| | [[File:CSIRO ScienceImage 1739 Testing soil pH.jpg|thumb|Field testing for soil pH]] |
| ==pH in water== | | ==pH in water== |
| [[File:Red pH meter reads 4.96.jpg|thumb|pH meter in water.]]
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| ==Soil or media pH== | | ==Soil or media pH== |