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 Digital Thermometer for Ultra-Low Freezers, -200/1370C x 0.1C, C&F w/60ml sand filled bottle, Factory Certified @ -80, -20, 0C
NC0745665 DIG FRZR THERMTR ACCULF307FC
Ptc Instruments THERMOMETER, SURFACE, 50-750F
Designed for applications such as: hot plates; griddles; die-cast dies; foundry core boxes; annealing ovens; weld preheats; motors, generators, and engines; bearings; boilers, tanks ect. •Accuracy of ±2% of Full Scale Range •NIST/A2LA ISO 17025 3 Point Certification Available •Every Unit Individually Calibrated •Time constant from 0.06 to 1 minute (depending on the range) •Diameter 2 in. (5.1 cm). •Height ½ " (1.3 cm)
Thermco Products Inc Precision Laboratory Thermometer, Red Spirit Filled, Non-Mercury Fractional Degree, 5, 76mm Partial Immersion, 610mm Length
Precision Laboratory Thermometer, Red Spirit Filled, Non-Mercury Fractional Degree, 5, 76mm Partial Immersion, 610mm Length. NIST TraceableNon-Mercury Red Spirit Filled Thermometers. Total and Partial Immersion. Individually Serializedrialized.
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)
Revvity Health Sciences Inc Ceramic Beads Pre-Filled 2 mL 96 Deep Well Plates, 1.4 mm (10/pk)
Ceramic Beads Pre-Filled 2 mL 96 Deep Well Plates, 1.4 mm (10/pk)
Grainger Dial Indicator 0 to 10mm 0-50-0
The Mitutoyo Back Plunger Dial Indicator is a precision measuring instrument used to accurately measure small distances and variations. It has a measuring range of 0-1" (0-25mm) with graduations of 0.001" (0.01mm). The indicator has a carbide-tipped contact point, jeweled movement, and satin chrome finish. It can be used on surfaces not perpendicular to the stem. This high quality dial indicator is ideal for use in inspection, machine shops, tool rooms and more.
