Although glass thermometers are gradually being replaced by new devices such as digital thermometers, they still offer economic and practical advantages in certain scenarios.

1. Economic Benefits
   Glass thermometers have low manufacturing costs and are relatively inexpensive, making them suitable for users with limited budgets. Additionally, their maintenance costs are low, requiring only regular calibration.

2. Practicality
   In situations where high-precision measurements are not required (such as daily temperature monitoring or teaching experiments), glass thermometers are sufficient. Their simple structure, ease of operation, and lack of need for a power source make them suitable for use in remote areas or fieldwork.

3. Limitations
   Glass thermometers have a limited measurement range and are fragile, making them unsuitable for high-temperature, high-pressure, or corrosive environments. Additionally, their readings rely on manual observation, which may introduce subjective errors.