Abstract: A device is provided for a floating temperature indicating device. The floating temperature indicating device includes a waterproof casing, a temperature sensor, and an illumination system. The waterproof casing is configured to protect the floating temperature indicating device from liquid and cause the floating temperature indicating device to be buoyant. The temperature sensor is configured to measure a temperature of a liquid within which the device is disposed. The illumination system is configured to emit a light corresponding to the temperature of the liquid. The waterproof casing may enclose the temperature sensor or the illumination system.