What is pH meter? Md. Saifur Rahman pH meter is a device used for knowing the value pH of an unknown solution. Inserting the electrode of the pH meter in the unknown solution the value of pH can be known directly from the digital display of the pH meter.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?