pH is the scale or unit which is used to measure the acidity or alkalinity of the water-based solutions. The range of pH scale is 0 to 14; if the value of pH is less than 7 then the solution will be acidic. And if it is Higher, then the solution will be basic and 7 would be neutral.
pH Meter is an electronic device which is used to check the pH of the solution. Most of the PH Meter can check PH, ORP and Temperature in the solution