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
Material | Glass |
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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™ 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.
Brannan™ Forehead Clinical Thermometer
Brannan™ Forehead Clinical Thermometer is a safe, reusable thermometer strip that takes body temperature on contact.
Brannan™ Initial™ Green Spirit-filled Partial Immersion Thermometer
Provides vibrant, easy to read measurements. Brannan™ Initial™ Green Spirit-filled Partial Immersion Thermometer is designed with moulded non-roll glass device to helps prevent breakage. Includes integral bulb with reinforced stirring tip.
Accuracy | ±1.5 at 35°C |
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Product Type | Laboratory Thermometer |
Thermometer Fill | Green Spirit |
Material | Glass |
Subdivision | 1°C |
Temperature Range (Metric) | -10°C to +110°C |
Max. Temperature (Metric) | 110°C |
Min. Temperature (Metric) | -10°C |
Immersion Length | 76 mm |
Material | Glass |
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Width (Metric) | 1.2 cm |
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 |
Brannan™ Lab Thermometer with 3-points Traceable Calibration
General purpose laboratory thermometer complete with calibration certificate.
Material | Glass |
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Certifications/Compliance | UK Traceable to National Standards ISO 9001 |
Width (Metric) | 1.2 cm |
Brannan™ Styrene Wall Thermometer
Brannan™ Styrene Wall Thermometer is large with bold black print and suitable for indoor and outdoor use.
Brannan™ Batch Sampling Thermometers
Confirms typical conditions to which batches in process or storage are subjected. Brannan™ Batch Sampling Thermometers help to smooth out temperature fluctuations caused by thermostats or the opening of cabinets.
Accuracy | ± 0.7°C |
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Length (Metric) | 145 mm |
Product Type | Batch Sampling Thermometer |
Thermometer Fill | Blue Spirit |
Certifications/Compliance | UKAS Certificate |
Brannan™ Total Immersion Initial™ Green Spirit Filled Thermometers
Ideal for educational use. Brannan™ Total Immersion Initial™ Green Spirit Filled Thermometers offer significant savings while making no compromises to traditional Brannan quality and accuracy.
Brannan™ Oven Batch Sampling Thermometer
These precision test thermometers are sealed into a 30mL polypropylene bottle containing a heat transfer medium and are ideally suited to monitor the temperatures of samples in controlled storage.
Brannan™ Digital Fridge Thermometer with Alarm
Sounds an alarm sounds and flashes LED lights for 5 seconds every minute when the temperature goes outside the safety zone. Brannan™ Digital Fridge Thermometer with Alarm includes 1m probe cable and suction pad.
Brannan™ Initial™ Lab Thermometer with 3 Point Traceable Calibration
Initial™ green spirit lab thermometer with calibration certificate.
Length (Metric) | 20 cm |
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Thermometer Fill | Green Spirit |
Immersion Type | Partial Immersion |
Min. Temperature (English) | 14°F |
Material | Glass |
Subdivision | 1.0°C |
Max. Temperature (Metric) | 110°C |
Width (Metric) | 1.2 cm |
Accuracy | ± 1.5°C at 35°C |
Max. Temperature (English) | 230°F |
Temperature Range (English) | 14°F to 230°C |
Temperature Range (Metric) | -10°C to +110°C |
Min. Temperature (Metric) | -10°C |
Immersion Length | 76 mm |