Thermometry is the measurement of temperature. Temperature can be measured via a diverse array of sensors and instruments.  Industrial thermometers are used for temperature measurement in many industrial applications. Applications include process temperature monitoring in various industrial markets.  Traditional liquid-in-glass design is typically used due to low cost and ease of use.  Industrial thermometers are basic bulb style thermometers.  Bulb thermometers rely on the simple principle that a liquid changes its volume relative to its temperature. Liquids take up less space when they are cold and more space when they are warm.