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™ Lab Thermometer
A general purpose/stirring thermometer for a wide application of laboratory needs.
Brannan™ Lab Thermometer
General purpose laboratory thermometer without calibration certificate.
Brannan™ ECO-therm Lab Thermometer
Green spirit thermometers filled with non toxic expansion liquid.
VEE GEE Glass Thermometer
The serialized glass thermometer is a precise instrument suitable for various general-purpose applications in laboratories, universities, food and beverage, environmental, wastewater, and other settings
H-B Instrument™ Easy-Read™ General Purpose Liquid-In-Glass Thermometers: Partial Immersion
Easy-to-read partial immersion thermometers.
H-B Instrument™ Enviro-Safe™ Dry Block/Incubator Thermometers
EnviroKleen™-certified environmentally friendly with 100% non-toxic, non-hazardous, biodegradable liquid fill. H-B Instrument™ Enviro-Safe™ Dry Block/Incubator Thermometers are 175mm (6.9 in.) liquid-in-glass, 35mm immersion thermometers.
H-B Instrument™ Enviro-Safe™ General Purpose Liquid-In-Glass Thermometers
Certified environmentally safe thermometers replace dangerous mercury.
Fisherbrand™ EverSafe&Trade; Blue Spirit Thermometers
Filled with biodegradable, non-toxic blue liquid. Fisherbrand™ EverSafe™ Thermometers are liquid-in-glass immersion thermometers filled with mercury-free liquid/dye and fitted with an anti-roll device for easy reading with maximum safety. Available in a variety of temperature ranges.
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.
Brannan™ LO-tox™ Lab Thermometer
LO-tox™ lab 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.
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™ Horizontal Fridge Freezer Thermometer
Indicates recommended food storage temperature zones. Brannan™ Horizontal Fridge Freezer Thermometer sits on a shelf or hangs from a rack.