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™ Traceable™ Refrigerator/Freezer Alarm Thermometers
Provides accurate reading when freezer/refrigerator doors are open with temperature-buffered, sensor-sealed in bottled glycol solution
Fisherbrand™ Traceable™ Vaccine Refrigerator/Freezer Thermometer
Monitors temperature of vaccine in freezers, water baths, heating blocks, incubators, and refrigerators with enclosed temperature-buffered sensor.
Fisherbrand™ Traceable™ Refrigerator/Freezer Ultra™ Thermometer
Monitor two different areas at the same time with Traceable™ Refrigerator/Freezer Ultra™ Thermometer.
Digi-Sense™ Ultra Low Freezer Verification Thermometer
Ultra Low Freezer Verification Thermometer - Accurately monitor temperatures in freezers, refrigerators, incubators, ovens, and other environments where stability is required. Thermometers can be removed for recalibration. A magnetic attachment with pressure-sensitive backing enables the bottle to be attached to a metal wall or door.
Cole-Parmer™ Digi-Sense™ Traceable™ Jumbo Refrigerator/Freezer Thermometer with Calibration
The Digi-Sense™ Traceable™ Jumbo Refrigerator/Freezer Thermometer with Calibration with an alarm that provides an alert when the temperature rises above or falls below a set point.
H-B Instrument™ SP Scienceware™ Calibrated Electronic Verification Thermometers, Calibrated for Freezers
Digital thermometers verify sample temperatures in freezers, refrigerators, incubators and ovens. Available calibrated for specific applications and equipment.
Bel-Art™ H-B Frio-Temp Freezer Verification Thermometer with Individual Calibration Report
These mercury free, calibrated thermometers cover ranges from -90°C to +25°C and are calibrated at one or two specific temperatures.
H-B Frio-Temp SP Scienceware™ Calibrated Electronic Verification Thermometers, Calibrated for Refrigerators and Freezers
Digital thermometers verify sample temperatures in freezers, refrigerators and incubators. Available calibrated for specific applications and equipment.
Karl Hecht™ Freezer Thermometer
Monitor freezer temperatures accurately. Karl Hecht™ Freezer Thermometer is officially tested and includes a holder.
Karl Hecht™ Freezer-Fridge Thermometer
For aid in maintaining and monitoring consistent temperatures in freezers and fridges.
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™ Batch Sampling Freezer Thermometer with Calibration Certificate
Precision test batch sampling freezer thermometers sealed into a 30 mL polypropylene bottle containing a heat transfer medium, ideally suited to monitor the temperature of samples in a controlled storage. Complete with traceable calibration.
Brannan™ Horizontal Fridge/Freezer Thermometer with 3 point Traceable Calibration Certificate
130 mm white horizontal fridge or freezer thermometer. Complete with 3 point traceable calibration.
H-B Frio-Temp SP Scienceware™ Calibrated Electronic Verification Thermometers, Calibrated for Incubators
Digital thermometers verify sample temperatures in freezers, refrigerators, incubators and ovens. Available calibrated for specific applications and equipment.