How do Marine thermometer readings?

In our life, often can use thermometer, such as measuring room temperature and food thermometer, etc. The scope of the thermometer was actually far more than these. Today ask you for a special use in the ship two thermometer and their method of reading. A bar type Marine thermometer ( As shown in the figure below) , is a kind of glass rod thermometer. The thermometer when use to look at the indicated temperature and environmental temperature whether conform to, if there is a error of different means, should not be used again. When the temperature is measured with a glass rod thermometer, due to the liquid have capillarity tube, when reading data for liquid column on the concave or convex corresponds to the scale for reading. Second, pointer thermometer, common bimetallic thermometer and pressure type thermometer. For bimetallic thermometer and pressure thermometer read data should be in the line of sight of observer vertical alignment needle tip refers to scale value for the temperature measurement value. The choose and buy Marine temperature time, due to the temperature of the glass rod thermometer general detection range within 200 ℃, bimetallic thermometer and pressure and the temperature of the thermometer is usually higher. In order to protect the thermometer is not damaged, before buying a thermometer, be sure to have to know the temperature of the measured medium range.