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).
Grainger Dial Indicator 0 to 1mm 50-0-50
The Mitutoyo Horizontal Dial Test Indicator is a precision measuring instrument used to accurately measure small distances and variations. It has a measuring range of 0-0.5" (0-12.7mm) with graduations of 0.001" (0.01mm). The indicator has a horizontal dial face with a bezel clamp to mount on surfaces. It can measure variations in travel, vibration, runout, deflection and more. The indicator has a carbide contact point and comes with a NIST traceable certificate. It is made in Japan by Mitutoyo, a leading manufacturer of precision measuring tools.
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.
Cole-Parmer Digi-Sense Calibrated Liquid-In-Glass Thermometer; -10 to 225C, Total 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.
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.
Ace Glass, Inc. 25mm non-mercury immersion thermometer
25mm non-mercury immersion thermometer for use with specific gravity bottles. Thermometer has a range of 14 to 37 degrees C with 0.2 subdivisions, and a 10/18 standard taper joint.
Grainger Cls 2 Trnsfrmr 30VA Enclosed Foot
The Edwards Signaling 30VA Class 2 Transformer is a UL Listed Class 2 transformer that steps down 120VAC to 24VAC. It has a maximum load rating of 30VA and provides short circuit protection. This transformer can be used for doorbells, chimes, nurse call systems, security systems, fire alarm systems, and other low voltage control applications. The transformer has an all-steel construction with a scratch resistant powder coated finish, measures 5-1/4" H x 4-3/8" W x 3-3/8" D, and weighs 4 lbs. It comes with a 5 year warranty.