Manual Thermometers
Manual Thermometers
Mercury, non-mercury (liquid in glass), or bimetallic thermometers with analog displays, for general and application-specific use, with various temperature-range capacities and accuracies; may be traceable or certified to international standards.
In 1714, the mercury-in-glass thermometer was invented in Europe by physicist Daniel Gabriel Fahrenheit. Typically, the mercury is contained in a reservoir that opens to narrow glass tube. The distance that the mercury flows into the tube is dependent on the temperature to which the thermometer is subjected. The space above the mercury may be filled with air or an inert gas, or it may be a partial vacuum.
Thermometers are calibrated by exposing them to a known temperature and then marking the height of the mercury at that temperature. For example, one might calibrate to the freezing temperature of water (0°C or 32°F) by placing the thermometer in a mixture of ice and water. Then the thermometer could be submerged in boiling water to determine the point where the water changes from a liquid to a vapor (100°C or 212°F).
Mercury thermometers are still considered to be some of the most accurate temperature indicators. They can be used for a wide range of temperatures, from -37°C to 356°C (-35°F to 673°F). Modifications such as adding an inert gas above the mercury or replacing the glass with fused quartz can extend the upper temperature limit to as high as 800°C (1,470°F).
Mercury cannot be used below -38.83°C (-37.89°F), the temperature at which it becomes a solid. Moreover, nitrogen in the thermometer can flow down into the column and become trapped if the mercury solidifies, which makes the thermometer unusable. Use a thermometer that contains a mercury-thallium alloy for measuring lower meteorological temperatures – it will remain liquid to -61.1°C (-78.0°F).
Fisherbrand™ Red Spirit Filled Total Immersion Thermometers
A general purpose/stirring thermometer for a wide application of laboratory needs. Fisherbrand™ Red Spirit Filled Total Immersion Thermometers have a white backing for readability.
Alla France™ Total Immersion Precision Thermometer
Use these thermometers for a variety of applications. Alla France™ Total Immersion Precision Thermometers are ideal for battery testing.
H-B Instrument™ Easy-Read™ General Purpose Liquid-In-Glass Thermometers: Partial Immersion
Easy-to-read partial immersion thermometers
H-B Instrument™ Easy-Read™ General Purpose Liquid-In-Glass Thermometers: Total Immersion
Easy-to-read total immersion thermometers
Fisherbrand™ Traceable™ Refrigerator/Freezer Alarm Thermometers
Provides accurate reading when freezer/refrigerator doors are open with temperature-buffered, sensor-sealed in bottled glycol solution
H-B Instrument™ Easy-Read™ General Purpose Liquid-In-Glass Thermometers: Partial Immersion
Easy-to-read partial immersion thermometers.
Fisherbrand™ General Purpose Liquid-in-Glass Total Immersion Thermometers: Blue Organic Fill
With blue organic filling solution. Fisherbrand™ General Purpose Liquid-in-Glass Total Immersion Thermometers are ideal for use in chemical laboratories, universities, scientific institutions, food and beverage processing and the petrochemical industry.
H-B Instrument™ Enviro-Safe™ General Purpose Liquid-In-Glass Thermometers
Certified environmentally safe thermometers replace dangerous mercury.
H-B Instrument™ Easy-Read™ Individually Calibrated Liquid-In-Glass Thermometers: Partial Immersion
Individual Calibration Report as needed for many standard operating procedures
Bel-Art™ H-B Durac Plus Ultra Low Liquid-In-Glass Laboratory Thermometer
Bel-Art, H-B Durac Plus Liquid-in-Glass Laboratory Thermometers are partial and total immersion thermometers for Low Temperature Applications.
Brannan™ Partial Immersion Spirit-Filled Thermometers
Filled with a brightly colored, mercury-free spirit. Brannan™ Partial Immersion Spirit Filled Thermometers use specially selected filling materials covering temperatures down to -200°C and feature a non-roll cap with suspension ring.