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).
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.
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.
Alla France™ Total Immersion Precision Thermometer
Use these thermometers for a variety of applications. Alla France™ Total Immersion Precision Thermometers are ideal for battery testing.
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.
Fisherbrand™ Lab Thermometer
A general purpose/stirring thermometer for a wide application of laboratory needs.
H-B Frio-Temp SP Scienceware™ Calibrated Electronic Verification Thermometers, Calibrated for General Applications
Digital thermometers verify sample temperatures in freezers, refrigerators, incubators and ovens. Available calibrated for specific applications and equipment.
H-B Instrument™ Enviro-Safe™ General Purpose Liquid-In-Glass Thermometers
Certified environmentally safe thermometers replace dangerous mercury.
Brannan™ LO-tox™ Lab Thermometer with 3-points Traceable Calibration
LO-tox™ lab thermometer complete with calibration certificate.
Amarell™ Total Immersion Low Temperature Laboratory Thermometer
Precision thermometer, low temperatures, enclosed scale, capillary lens front, total immersion, Richter-top finish with button, suitable for government verification
Amarell™ Standard Milk Glass Total Immersion Thermometer
Use for total immersion applications. The standard milk glass total immersion thermometers use non-mercury colored fill.
Brannan™ LO-tox™ Lab Thermometer with 3-points Traceable Calibration
LO-tox™ lab thermometer complete with calibration certificate.
Brannan™ LO-tox™ Lab Thermometer
LO-tox™ lab thermometer without calibration certificate.
Brannan™ Lab Thermometer
General purpose laboratory thermometer without calibration certificate.
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.