Portable pH meters are handheld analytical instruments designed to measure the acidity or alkalinity (pH) of liquids quickly and accurately in field or laboratory settings. They typically feature a probe that is immersed in the sample, with the device displaying the pH value digitally. Portable pH meters offer convenience, portability, and ease of use, often including features such as automatic temperature compensation, data logging, and calibration functions. They are widely used in water quality testing, environmental monitoring, agriculture, food and beverage production, chemical laboratories, and educational applications, providing reliable on-site measurements without the need for bulky equipment.