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).
Thermco Products Inc ASTM THERMOMETER WITH CERT
ASTM Thermometer with Cert S120C Kinimatic Viscosity +38.6 to 41.4°C 0.05°C TOTAL 310mm
Cole-Parmer Digi-Sense Dry Block/Incubator Liquid-In-Glass Thermometer; 20 to 100C, 76mm Immersion, Organic Liquid Fill
These thermometers are designed for use in specific applications. These Durac thermometers feature markings that are permanently printed on the glass, individually serialized, and red spirit liquid that has a dark scale contrasts against a white background. Some thermometers are PFA coated for added safety which may cause a slight change in accuracy up to 1 division. Dry block thermometers - designed for use in all standard heating blocks and water baths with most having arrows indicating critical temperatures.
Chemglass Life Sciences Thermometer, Non-Mercury, Total Immersion, -20°C to 110°C, 305mm OAL
Thermometer, Non-Mercury, Total Immersion, -20°C to 110°C, 305mm OAL. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. All ranges have 1º subdivisions. Thermometer has a white back and a 6 to 7mm outer diameter.
Thermco Products Inc Precision lab Hg thermometer, -10 deg./200 deg.C, 1.0 deg.C div, TOTAL imm, 305mm
High precision mercury SAMA thermometer that meet or exceed the specifications of the American National Standards Institute. Specifications approve by N.I.S.T. and ASTM. Individually serialized and permanetly marked. Made with precision yellow backed tubing.
Thermco Products Inc -38/50C X 1.0C
ASTM S5C thermometer (blue spirit) certified at the ASTM recommended temperatures and calibrated against N.I.S.T. standards. A N.I.S.T. traceable document is completed in the Thermco ISO17025/ILAC accedited laboratory.
Cole-Parmer Ashcroft A960AF6 Adjustable Angle Glass Thermometer, 6" Stem; 30/300 F
FEATURES
- Mercury free blue liquid in glass with magnifying lens for easy readability
- Molded Valox - V-shaped black case for ranges up to and including 300F
- Die cast black aluminum V-shaped case for ranges above 300F
- Glass front excludes dust and dirt
- White aluminum scale with bold black graduations and figures
- Accuracy is 0.1% of full scale
- Easy adjustment permits case and stem to be rotated 360
- 9" scale is standard
- 1-1/4" - 18" NEF swivel nut
Biolegend Purified anti-MTHFD1 [W22086A]; Isotype: Rat IgG2b, κ; Reactivity: Human, Mouse; Apps: WB, ICC; Size: 100 ug
Purified anti-MTHFD1 [W22086A]; Isotype: Rat IgG2b, κ; Reactivity: Human, Mouse; Apps: WB, ICC; Size: 100 ug
Ace Glass, Inc. Thermometer, 0 to 230°F, 12in length, 76mm immersion, accuracy ±2°F
76mm immersion thermometer ranging from 0 to 230F. Thermometer is 12 in length and has an accuracy of 2F. In case of breakage this PFA coated thermometer will contain the organic black liquid filling. Thermometer comes with a NIST traceable statement of accuracy.
Ace Glass, Inc. Thermometer, -20 to 110°C, 12" length, 76mm immersion
-20 to 110C 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.
Ace Glass, Inc. Thermometer, 20 to 300°F, 8" length, 50mm immersion
20 to 300F enviro-safe economy thermometer with a 50mm immersion length. 8 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.