Liquid In Glass Thermometers
Liquid In Glass Thermometers
Liquid-in-glass thermometers are among the oldest and most reliable instruments for temperature measurement, using the thermal expansion of a liquid column within a sealed glass tube to indicate temperature. In metrology and calibration laboratories, they serve as primary or secondary reference standards, offering stable and repeatable readings without electronic components or power sources. Fill liquids include mercury for wide-range, high-accuracy applications, and organic spirit fluids for lower-temperature ranges and safety-sensitive environments.
These thermometers are widely used in pharmaceutical, food safety, and industrial process environments where certified, traceable measurements are required. Calibration kits combining liquid-in-glass thermometers with temperature baths and documentation support ISO/IEC 17025-compliant laboratory workflows.
Typical Applications
- Primary and secondary reference standards in calibration and metrology laboratories
- Temperature verification in pharmaceutical storage, cold chain, and food processing facilities
- Calibration checks for industrial thermometers, probes, and sensors
- Environmental monitoring in temperature-controlled test chambers
- Scientific research and education where traceable temperature standards are required
Popular Brands
Fluke Calibration offers certified liquid-in-glass thermometer kits designed for traceable calibration workflows. WIKA and Brannan are recognized suppliers of high-accuracy reference thermometers for standardized test environments.