PHS-3E digital pH meter measures the pH value of the solution and can also measure the electromotive force mV value. The setting and measurement of each parameter are switched by switches and displayed by LED digital light-emitting tubes. This instrument uses a full-scale temperature composite glass electrode, which can accurately set the temperature of the measured solution, which is displayed by a digital light-emitting tube and achieves temperature compensation at the same time. The instrument has high measurement accuracy, good reliability, strong stability, and is easy to operate and use. It is an ideal instrument for laboratories.