A pocket pH meter is a handheld device used to measure the pH level of a solution. It is a portable version of the larger, benchtop pH meters commonly used in scientific and industrial settings.

The device is small and easy to use, making it ideal for fieldwork or for quick, on-the-spot measurements. It consists of a small probe, typically made of glass or plastic, that is inserted into the liquid to be tested. The probe is connected to a digital display, which shows the pH reading in real-time.

To use a pocket pH meter, the user first calibrates the device using standard pH buffer solutions, which have known pH values. The device is then ready to use to measure the pH of an unknown solution. The user simply inserts the probe into the solution and waits for the reading to stabilize, typically within a few seconds. The pH value is then displayed on the digital screen.

Pocket pH meters are commonly used in a variety of applications, such as testing the pH of soil, water, or food products. They are also used in aquariums and swimming pools to ensure proper pH levels for fish and swimmers, respectively. The pH range of a pocket pH meter can vary depending on the model, but most can measure pH values from 0 to 14, which covers the entire range of acidity and alkalinity.