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).
H-B Frio-Temp SP Scienceware™ Calibrated Electronic Verification Thermometers, Calibrated for General Applications PROMO
Digital thermometers verify sample temperatures in freezers, refrigerators, incubators and ovens. Available calibrated for specific applications and equipment.
H-B Instrument™ Durac™ Bi-Metallic Thermometers: 25mm Dial
Bi-Metallic thermometers with 2.5% or 2° accuracy—ideal for measuring temperatures in pipes, griddles and hot plates
H-B Instrument™ Durac™ V-Back Thermometers
Attached to an aluminum V-shaped backing
H-B Instrument™ Easy-Read™ Thermometers
Non-toxic, biodegradable, Enviro-Safe™ liquid, against yellow back glass provides easy readability and fewer reading errors.
H-B Instrument™ Bluetooth Verification, Probe and Stem Thermometers
Bluetooth enables remote monitoring and alerts
H-B Instrument™ Durac™ Aquarium Thermometers
Available as either submersible or floating type
H-B Instrument™ General Purpose Liquid-in-Glass Total Immersion Thermometers
These Liquid-in-Glass Total Immersion Thermometers are ideal for general use in chemical laboratories, universities, scientific institutions, food and beverage processing, petrochemical laboratories, pharmaceutical industry, medical industry, manufacturers, dairies, breweries, and distilleries.
H-B Instrument™ Easy-Read™ Environmentally Friendly Liquid-In-Glass Tank Thermometers
Cup holds liquid sample for effortless reading
H-B Instrument™ Durac™ Bi-Metallic Surface Temperature Thermometer: Plastic, 0° to 250°F, Double Spring Mount Back
With 2.5% or 2.5° accuracy — ideal for measuring temperatures in pipes, griddles and hot plates
H-B Instrument™ Durac™ Plus™ Liquid-In-Glass PFA-Coated Total Immersion Thermometers
Provides safety and protection from breakage
H-B Instrument™ Durac™ Plus™ Precision Liquid-In-Glass Total Immersion Thermometers
Fractional divisions for more accurate readings. H-B Instrument™ Durac Precision Liquid-in-Glass Total Immersion Thermometers are made with permanently fused markings and fractional degrees to provide precision and ensure accuracy.
H-B Instrument™ Durac™ Plus™ Liquid-In-Glass Armored Thermometer
Features an open protective nickel plated brass armor
H-B Instrument™ Durac™ Blood Bank Thermometers
Indicate critical temperature ranges in blood banks
H-B Instrument™ Enviro-Safe™ General Purpose Liquid-In-Glass Thermometers, Partial Immersion 3 in.
Certified environmentally safe thermometers replace dangerous mercury