pH measurements are a common practice in several industries including environmental, chemical and biotechnology. The effect of temperature on the accuracy and precision of pH measurements requires the need for a temperature compensated system. This paper will discuss the fabrication and performance of a combination pH sensor that is temperature compensated by monitoring the glass membrane impedance. By using the membrane impedance as an indicator of temperature, a separate temperature sensor is not required, thereby allowing measurements in small vessels such as test tubes and microtiter well plates.