This 2-in-1 pH meter with one-hand operation measures the pH value of liquids via the galvanic voltage difference between acidic, neutral and alkaline liquids. In addition, the liquid temperature is measured and displayed with simultaneous indication of both measured values on the LCD display with permanent backlighting. The easily replaceable sensor head, which contains the sensor for pH measurement and temperature measurement in °C or °F, is attached to the robust and waterproof housing.