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).
United Scientific™ Metal-Back Thermometer
Alcohol-filled glass Metal-Back Thermometer.
United Scientific Supplies Total Immersion Thermometers, Red Spirit Filled
Student-grade thermometers provide increased safety and economic pricing
Eisco™ Spirit-Filled Wall Thermometer
Mountable wall thermometers for measuring the temperature of any indoor space.
Eisco™ Wall Thermometer
Simple plastic Wall Thermometer provides readings in both Fahrenheit and Celsius.
Eisco™ Spirit Filled Aluminum Thermometer
Spirit Filled Aluminum Thermometer is a safe alternative to mercury thermometers, and features a solid aluminum backing and a hole for easy hanging.
3B Scientific™ Moll-Type Thermopile
Highly sensitive device for radiation measurement. The 3B Scientific Moll-Type Thermopile is used for thermal radiation of a black body, reflection of the long-wave thermal radiation, intensity distribution across the spectrum, Wien's displacement law.
H-B Instrument™ Easy-Read™ Individually Calibrated Liquid-In-Glass Thermometers
Individual Calibration Report as needed for many standard operating procedures.
Fisherbrand™ Durac™ Plus™ Thermometers
Ideal for use in applications in which a very precise, accurate temperature measurement is required.
LaMotte™ Armored Thermometer
A precision, nonmercury thermometer, furnished in a protective plastic jacket with a window opening.
Fisherbrand™ Red Spirit Thermometer
Red spirit filled thermometer with white back glass.
Fisherbrand™ Laboratory Grade Spirit Thermometers - Partial Immersion
Check up to five results to perform an action.
Fisherbrand™ Laboratory Grade Spirit Thermometers - Total Immersion
Check up to five results to perform an action.
Boiling Point Thermometers
Durable, non-toxic thermometers.
Giant Classroom Thermometer
Tired of small thermometers?