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).
Ptc Instruments THERM SPOT CHECK 0-525C
Direct Contact Spot-Check Thermometer, Temp Range 10 to 525 deg.C, Accuracy +/-2% of full scale range, Dimensions: dia. 1-3/4 in. (4.4cm), Height 1/2 in. (13cm), Weight 1/2 oz.
Essendant Tripp Lite by Eaton USB 3 1 Gen 1 USB-C to HDMI Adapter USB-A/USB-C PD Charging/Gigabit Ethernet 3 White
Tripp Lite by Eaton USB 3 1 Gen 1 USB-C to HDMI Adapter USB-A/USB-C PD Charging/Gigabit Ethernet 3 White
Grainger Digital Food Service Thermometer 1.7 L
The Grainger Approved Digital Food Service Thermometer is a digital thermometer designed for commercial kitchen use. It features a stainless steel probe with a temperature range of -58 to 572°F (-50 to 300°C), and an accuracy of ±1.8°F/1°C. The large LCD display shows the temperature reading in Celsius or Fahrenheit. It has a food-safe ABS plastic body, and includes a pocket clip and probe cover. The thermometer is powered by a single LR44 button cell battery. It meets NSF standards for commercial food service.
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; -20 to 110C, 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.
Revvity Health Sciences Inc Ceramic Beads Pre-Filled 2 mL 96 Deep Well Plates, 0.1 mm (2/pk)
Ceramic Beads Pre-Filled 2 mL 96 Deep Well Plates, 0.1 mm (2/pk)
Ace Glass, Inc. Thermometer, 0 to 230°F, 12" length, 76mm immersion
0 to 230F 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; -20 to 150C, 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.