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).
LaMotte™ Armored Thermometer
A precision, nonmercury thermometer, furnished in a protective plastic jacket with a window opening
Thermco™ Ertco™ ASTM 125C
Manufactured in accordance with specifications of the American Society for Testing and Material
Thermco™ Ertco™ ASTM 110C
Manufactured in accordance with specifications of the American Society for Testing and Material
Thermco™ Ertco™ ASTM 73F
Manufactured in accordance with specifications of the American Society for Testing and Material
Thermco™ Ertco™ ASTM 43C
Manufactured in accordance with specifications of the American Society for Testing and Material
Thermco™ Ertco™ ASTM 74C
Manufactured in accordance with specifications of the American Society for Testing and Material
Moore Medical Room Thermometer
Features a recessed red spirit scale
Thermco™ Ertco™ ASTM 43F
Manufactured in accordance with specifications of the American Society for Testing and Material
Wall Thermometer
Filled with red alcohol
SI Manufacturing Student Thermometer
For all grade levels.
Fisherbrand™ Red Spirit Thermometer with Closed Metal Case
Red spirit filled thermometer with white back glass.
