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).
Chemglass Life Sciences Thermometer, Non-Mercury, Variable Immersion, -10°C to 250°C, Immersion Range is 178mm to 305mm (7" to 12"), 635mm OAL
Thermometer, Non-Mercury, Variable Immersion, -10¿C to 250¿C, Immersion Range is 178mm to 305mm (7" to 12"), 635mm OAL. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. Constructed on two types of tubing sealed together below the scale, where the stem portion is made of very fine bore glass to minimize correction factors at immersion depths other than the mid-point of the stem. The scale portion is made of wide bore glass to facilitate reading of the thermometer. Each thermometer is supplied with an instruction sheet and listing of correction factors. All ranges have 1¿ subdivisions. Thermometer has a white back and a 6 to 7mm outer diameter. Can be used with any Chemglass threaded thermometer adapter.
Research Products International Corp Thermometer, 2 Solid Probe Sensors
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 NONMERCURY THERMOMETER THERMCO
-100/50 x 1.0C, Total immersion, Spirit, Certified -80, -70, -20, 0, 37C, w/case
Hach Company Thermometer, Enviro-Safe, Non-Mercury, -20 to 110°C
Enviro-Safe non-Mercury thermometers feature an exclusive biodegradable liquid and dye. Easy to read, aesthetically distinctive due to dark green liquid and permanently fused markings. Each thermometer, individually calibrated against NIST traceable equipment, identified by unique serial number for ISO9000 or other quality systems.
Cole-Parmer Ashcroft A935AF2 Adjustable Angle Glass Thermometer, 3.5" Stem; 0/120F
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 300°F
- Die cast black aluminum V-shaped case for ranges above 300°F
- 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
Cole-Parmer Digi-Sense Calibrated Liquid-In-Glass Thermometer; 0 to 300F, 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.
Chemglass Life Sciences Thermometer, Non-Mercury, Partial Immersion, -20°C to 150°C, 305mm OAL
Thermometer, Non-Mercury, Partial Immersion, -20¿C to 150¿C, 305mm OAL. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. All ranges have 1¿ subdivisions. Thermometer has a white back and a 6 to 7mm outer diameter, and is calibrated for 76mm (3") immersion.