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).
Cole-Parmer Digi-Sense Calibrated Liquid-In-Glass Thermometer; -1 to 51C, 76mm 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.
Thermco Products Inc Precision Taper Joint Non-Hg thermometer, Spirit, -10 deg./250 deg.C, 1 deg.C div, 25mm imm, 315mm, 10/18 taper
Manufactured with a 10/30 glass standard taper joint to fit in 10/18 joint of flasks and other laboratory glassware. Accurate to N.I.S.T. tolerances. Individually serialized. Thermometer may be Safety-Coated with TFE. Filled with a safe red spirit filling for safety purposes.
Thermco Products Inc -40 deg./25 deg.C & -40 deg./80 deg.F Refrigerator/Freezer Spirit
Ideal for both Refrigerators and Freezers, our dual-scale thermometer has a range of -40 to 25°C and -40 to 80°F. It features an enclosed bulb to help ensure average temperature readings and an open scale for easy, accurate readings. The thermometer’s rust-resistant case has stainless steel hangers with keyhole brackets for easy hanging and removal. Enamelled aluminium scale. Thermometer can hang or stand.
Grainger Cls 2 Trnsfrmr 20VA Enclosed Foot
The Dayton Class 2 Transformer is a 20 VA, 120V primary to 4V secondary transformer made by Dayton Electric Manufacturing. It has an aluminum enclosure and features two 4V secondary windings that can be connected in parallel for a 4V output at higher current. The transformer can supply up to 5 amps continuously and has a maximum temperature rise of 115C. It can be mounted on a wall or DIN rail and complies with UL and CSA standards. The transformer measures 3.5" x 3" x 3.25" and weighs 2.5 lbs.
Thermco Products Inc Accu-Safe Non-Mercury Laboratory Thermometers Fractional Degree
Range: -1 to 51°C, Immersion: 76mm, and Length: 400mm.
Hach Company Thermometer, Non-mercury, 30 to 50° C
Non-mercury thermometer, 30 - 50 degrees C Length: 250 mm Immersion: 76 mm Safety coated. Blue fill solution on white background provides excellent visibility.
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.
Thermco Products Inc General lab Non-Hg thermometer, Spirit, -30 deg./120 deg.F, 1 deg.F, 76mm imm,
Spirit filled double scale thermometer, white back tubing, with toughened bulbs. Suspension ring for hanging, vertical numbering. Individual serial numbered. Packed in non-roll square tubing. Permanent markings.
Ace Glass, Inc. Thermometer, -10 to 200°C, 12" length, 76mm immersion
-10 to 200C enviro-safe economy thermometer with a 76mm immersion length. 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 Calibrated Liquid-In-Glass Thermometer; -10 to 70C, 76mm 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 Ultra Low Liquid-In-Glass Thermometer; -100 to 50C, Total 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.