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A pH meter measures the hydrogen-ion activity in water-based solutions, indicating its acidity or basicity expressed as pH. (Wikipedia: pH Meter). A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH wiki:This Arduino pH Sensor / Meter Kit is able to measure the power of hydrogen. The Gravity interface make the kit easy to connect to Arduino, A pH Meter is not only considered by some to be an essential tool for all grain homebrewing and commercial brewing but is also a very useful tool to have In chemistry, pH historically denoting "potential of hydrogen" (or "power of hydrogen"), is a scale used to specify the acidity or basicity of an aqueous The glass pH probe contains two electrodes, a sensor electrode and a reference electrode. · When the probe is placed in a solution to measure the pH, hydrogenpH meter, electric device used to measure hydrogen-ion activity (acidity or alkalinity) in solution. Fundamentally, a pH meter consists of a voltmeter