Glass thermometers, as traditional temperature measurement tools, are widely used in laboratories, industrial production, and daily life. Their working principle is based on the thermal expansion and contraction of liquids (such as mercury or alcohol), indicating temperature through changes in the liquid column height. However, due to factors such as manufacturing processes, usage environments, and long-term wear, glass thermometers may develop errors. Therefore, regular calibration of glass thermometers is a crucial step to ensure measurement accuracy.

The purpose of calibration is to identify and correct errors in glass thermometers by comparing them with standard thermometers or constant temperature equipment of known accuracy. Calibration not only improves the reliability of measurement results but also extends the thermometer's service life. For example, in laboratories, uncalibrated thermometers may lead to experimental data deviations, affecting research conclusions; in industrial production, inaccurate temperature measurements may cause product quality issues or even safety incidents.