An improved temperature measuring device for the in-line temperature measurement of fluids which does not require intimate contact of the fluid with the temperature sensing element. In addition, the invention contains no internal cavities or crevices making it very advantageous for food and chemical usage. In the preferred embodiment, a liquid crystal temperature sensing element is affixed to a thermally conductive fluid carrying member. Each end of this fluid carrying member having fittings which enables the thermometer assembly to be quickly removed for cleaning and sanitizing.