Abstract: Method and an apparatus for, in the most preferred embodiment, measuring the temperature of liquid, such as urine, contained in a container using a new thermometer, referred to herein as a thermometer insert, including, at least, a thermal scale member mounted to an elongated backing member. The elongated backing member is resilient and "springs" back to its normally flat condition if bent. The thermal scale member includes an temperature indication region and numeric temperature indicia, and senses and indicates the temperature of the liquid in the container. The thermometer insert is placed into the container either before or after the liquid is deposited into the container. The thermometer insert and the wall of the container cooperate to hold the thermometer insert in engagement with the container wall so that the thermal scale member is capable of being observed through the container wall. After being used, the container, with the thermometer insert therein, can be reused or discarded.