This document introduces a pH and temperature measuring instrument with features such as waterproof microprocessor treatment, large LED display, and rubber protection ring. The instrument has automatic or manual temperature compensation, easy calibration method, low power indication, etc. The measurement range is 0.00 to 14.00 pH and 0 to 100℃, with an accuracy of 0.02 pH, 2mV, and 0.5℃, and a resolution of 0.01 pH, 1mV, and 0.1℃.