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).
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Filtered Search Results
Fisherbrand™ Lab Thermometer
A general purpose/stirring thermometer for a wide application of laboratory needs.
Product Type | Liquid Filled Thermometer |
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Thermometer Fill | Red Spirit |
For Use With (Application) | General use |
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.
Material | Glass |
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Width (Metric) | 1.2 cm |
Digi-Sense Pocket Liquid-In-Glass Thermometer, Closed Plastic Case, Organic Liquid Fill
The Pocket Liquid-In-Glass Thermometer with Organic Liquid Fill provides a low-cost way to measure temperature with a compact and durable plastic case.
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.
Material | Glass |
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Brannan™ White Wall Thermometer
Takes measurements with miscible red spirit filling. Brannan™ White Wall Thermometer. Displays both °C and °F temperature scales and is suitable for indoor and outdoor use.
Fisherbrand™ -20 to +110 Lo Tox™ Laboratory Immersion Thermometer
Lo Tox™ organic filling is specially chosen to achieve wide temperature span and provide the lowest practical levels of hazard.
Brannan™ Horizontal Fridge Freezer Thermometer
Indicates recommended food storage temperature zones. Brannan™ Horizontal Fridge Freezer Thermometer sits on a shelf or hangs from a rack.
Brannan™ Bimetallic Dial Thermometer
For measuring the temperature of flat surfaces such as hotplates. Brannan™ Bimetallic Dial Thermometers are scaled from 50° to 400°C.
Brannan™ Forehead Clinical Thermometer
Brannan™ Forehead Clinical Thermometer is a safe, reusable thermometer strip that takes body temperature on contact.
Brannan™ ECO-therm Lab Thermometer
Green spirit thermometers filled with non toxic expansion liquid.
Accuracy | ±1.5°C |
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Length (Metric) | 305 mm |
Product Type | Laboratory Immersion Thermometer |
Thermometer Fill | Green Spirit |
Material | Glass |
Subdivision | 1°C |
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.
Bottle Size | 2.5 x 6.3 cm (1 x 2.5 in.) |
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Min. Temperature (English) | -58°F |
Max. Temperature (Metric) | 70°C |
For Use With (Application) | Monitoring temperatures in freezers, water baths, heating blocks, incubators, and refrigerators |
Accuracy | ±0.5°C (-30°C to +50°C), ±1°C otherwise |
For Use With (Equipment) | Monitoring Temperature in Freezer, Water Bath, Heating Block, Incubator and Refrigerator |
Product Type | Refrigerator/Freezer Ultra Thermometer |
Max. Temperature (English) | 158°F |
Temperature Range (English) | -58°F to +158°F |
Weight (English) | 4 oz. |
Temperature Range (Metric) | -50°C to +70°C |
Min. Temperature (Metric) | -50°C |
Calibrated | Yes |
Display | Digital |
Resolution | 0.1° |
Cole-Parmer™ Digi-Sense™ Traceable™ Jumbo Refrigerator/Freezer Thermometer with Calibration
The Digi-Sense™ Traceable™ Jumbo Refrigerator/Freezer Thermometer with Calibration with an alarm that provides an alert when the temperature rises above or falls below a set point.