Assertion: ph meter | /r/CapableOf | measure the hydrogen-ion activity
Facets:
value: in water-based solutions
type: LOCATION
Source sentences:
text: A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or basicity expressed as pH. The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode, and so the pH meter is sometimes referred to as a "potentiometric pH meter".