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+[[File:Red pH meter reads 4.96.jpg|thumb|pH meter in water.]]
−
[[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==
−==Soil or media pH==
==Soil or media pH==