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 Instrument™ Easy-Read™ General Purpose Liquid-In-Glass Thermometers: Total Immersion
Easy-to-read total immersion thermometers
H-B Instrument™ Enviro-Safe™ General Purpose Liquid-In-Glass Thermometers
Certified environmentally safe thermometers replace dangerous mercury.
H-B Instrument™ Durac™ Plus™ Partial Immersion Thermometer
Ideal for 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™ Durac™ Bi-Metallic Dial Thermometers
Features 1/2 in. NPT threaded connection and polycarbonate lens.
H-B Instrument™ Easy-Read™ Individually Calibrated Liquid-In-Glass Thermometers
Individual Calibration Report as needed for many standard operating procedures.
H-B Instrument™ FRIO-Temp™ Precision Liquid-In-Glass Verification Thermometers
Verification of sample temperatures in freezers, refrigerators, incubators and ovens.
H-B Instrument™ Galileo Thermometer
Handcrafted and individually calibrated.
Supertek™ Lab Thermometer
The Lab Thermometers are etched with 1 degree increments and have red liquid to indicate temperature.
Giant Classroom Thermometer
Tired of small thermometers?
LaMotte™ Armored Thermometer
A precision, nonmercury thermometer, furnished in a protective plastic jacket with a window opening.
Boiling Point Thermometers
Durable, non-toxic thermometers.
Supertek™ Celsius and Fahrenheit Wall Thermometer
This Supertek™ Celsius and Fahrenheit Wall Thermometer is designed with a bulb guard and prismatic tube to enhance readability. It comes with a plastic base for added convenience.
DR Instruments DR-Scan™ Fore-Head Quick Fever Scan
DR-Scan™ provides an easy and safe way to know your body's approximate temperature.
