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™ Lab Thermometer
A general purpose/stirring thermometer for a wide application of laboratory needs.
Brannan™ Bimetal Dial Thermometer with Spiked Stem
Brannan™ Bimetal Dial Thermometer with Spiked Stem is constructed of stainless steel and is suitable for use with corrosive liquids.
Cole-Parmer™ Soil Thermometer
The Cole-Parmer™ long stem thermometers make compost and soil measurements easy.
H-B Instrument™ DURAC™ Bi-Metallic Min/Max Thermometer; -50/50°C (-58/122°F)
Maximum/Minimum thermometers display the current temperature and register the maximum and minimum temperatures attained since the last reset.
Hanna Instruments™ T-Shaped Thermometer
Calibration check device ensures accuracy
H-B Instrument™ Durac™ Bi-Metallic Thermometers: 33mm Dial
With 2.5% or 2° accuracy—ideal for measuring temperatures in pipes, griddles and hot plates
H-B Instrument™ SP Scienceware™ Calibrated Electronic Thermometers with Waterproof Sensor - Dual Zone: -40°/+70°C (-40°/+158°F) External
Digital thermometers that effectively measure the temperature of wet or dry environments including freezers, refrigerators, water baths, aquariums, incubators and more.
Fisherbrand™ Traceable™ Refrigerator/Freezer Alarm Thermometers
Provides accurate reading when freezer/refrigerator doors are open with temperature-buffered, sensor-sealed in bottled glycol solution
Fisherbrand™ Traceable™ Refrigerator/Freezer Ultra™ Thermometer
Monitor two different areas at the same time with Traceable™ Refrigerator/Freezer Ultra™ Thermometer.
Fisherbrand™ Traceable™ Vaccine Refrigerator/Freezer Thermometer
Monitors temperature of vaccine in freezers, water baths, heating blocks, incubators, and refrigerators with enclosed temperature-buffered sensor.
Brannan™ Lab Thermometer with 3-points Traceable Calibration
General purpose laboratory thermometer complete with calibration certificate.
Brannan™ Lab Thermometer
A general purpose/stirring thermometer for a wide application of laboratory needs.
Brannan™ LO-tox™ Lab Thermometer with 3-points Traceable Calibration
LO-tox™ lab thermometer complete with calibration certificate.