The image shows a drawing of a thermometer with a compass on it, which is used to measure the temperature of a tube.
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The image shows a drawing of a thermometer with a compass on it, which is used to measure the temperature of a tube. The thermometer is connected to a tube, and the compass is pointing to the right side of the image, indicating the direction of the temperature. The text accompanying the drawing provides further information about the thermometer, such as its purpose and how it works.
