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).
Shockwatch Div Mri ColdMark 5C / 41F
ColdMark temperature indicator monitors temperatures during shipping and storage, indicating if goods experience unacceptable conditions. These reliable temperature indicators provide visual evidence of exposure to unacceptably low temperature levels, allowing you to determine if product quality has been compromised. Temperature threshold: 5C/41F. Accuracy +/-1C. Shelf life 2 years. Single-use.
Cole-Parmer Digi-Sense Ultra Low Liquid-In-Glass Thermometer; -100 to 50C, 76mm Immersion
These thermometers are inexpensive and safe for use in laboratories, universities, food/beverage, environmental, wastewater, petrochemical, pharmaceutical and many other general-purpose applications. Choose from partial immersion or total immersion thermometers. Thermometers feature permanently fused markings, blue spirit liquid, white background glass; are also individually serial numbered. Include a ring top and a statement of accuracy supplied by manufacturer.
Cole-Parmer Digi-Sense Calibrated Liquid-In-Glass Thermometer; -1 to 51C, Total Immersion, Organic Liquid Fill
These thermometers are ideal for use in applications where a very precise accurate temperature measurement is required. Thermometers are individually calibrated to NIST standards at specific temperatures and supplied with an NIST report of calibration stating corrections to one-tenth the smallest division. Thermometers feature triangular anti-roll fitting, permanently fused markings, blue spirit liquid, white background glass; are also individually serial numbered. Include an NIST-traceable statement of accuracy and a triangular-style antiroll fitting.
Cole-Parmer Digi-Sense Soil Thermometer, 48" L x 0.25" Dia; 0-200F/ -15-90C
Thermometer is ideal for measuring core temperatures in compost piles, hay, soil, or grains. 3" diameter dial for easy reading. Calibrate with external reset screw. Thermometers meet ASME B40.3 standards for leak- and fog-proof operation.Tips are 0.25" dia for fast response.
Ace Glass, Inc. Thermometer, -20 to 110°C, 12" length, total immersion
-20 to 110C, total immersion, enviro-safe economy thermometer. 12 inches long. Thermometer is filled with organic black liquid, and is made from lead-free glass. Does not contain mercury. Comes with a NIST traceable statement of accuracy.
Cole-Parmer Digi-Sense ASTM Like Liquid-In-Glass Thermometer; 9C / Low-Pensky-Martens, 57mm Immersion, -5 to 110C, Organic Liquid Fill
These thermometers are precision manufactured to conform to ASTM E-1 specifications except for not being mercury filled. Designed for use in quality control laboratories or when mercury filled thermometers can not be used but where ASTM standards are still needed. ASTM established thermometer standards suited for special applications, and assigned an ASTM number according to each specification. Thermometers feature permanently fused markings, blue spirit liquid, white background glass; are also individually serial numbered.
Research Products International Corp Thermometer, 2 Bottle Probes
High accuracy dual channel thermometers feature 0.01° high resolution with accuracy of ± 0.30°C. Individual channels provide simultaneous monitoring of temperatures in separate locations. Display exact time and date when a min/max reading occurred and alarm sounded. Min/Max temperatures are programmable in 0.1°C increments over entire range of -50° up to +70°C. Temperature buffered solution probes contain a non-hazardous glycol mixture that eliminates rapid temperature changes when opening refrigerator or freezer door.
Available with one miniature size sensor that is chemical resistance and waterproof for use in water baths, incubators or dry block heaters. Supplied with Traceable Calibration Certificate (NIST), stand, mounting strips and battery.