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).
Med Vet International Thermometer with Grommet, J0813MD1, Each
Thermometer with Grommet, J0813MD1, Each
Ace Glass, Inc. Thermometer, -100 to 50c, 12" length, 76mm immersion
Thermometer, -100 to 50c, 12" length, 76mm immersion
Cole-Parmer Digi-Sense Soil Thermometer, 48" L x 0.25" Dia; 0-200F/ -15-90C
Thermometer is ideal for measuring core temperatures in compost piles, hay, soil, or grains. 3" diameter dial for easy reading. Calibrate with external reset screw. Thermometers meet ASME B40.3 standards for leak- and fog-proof operation.Tips are 0.25" dia for fast response.
Grainger Cls 2 Trnsfrmr 20VA Enclosed Foot
The Dayton Class 2 Transformer is a 20 VA, 120V primary to 4V secondary transformer made by Dayton Electric Manufacturing. It has an aluminum enclosure and features two 4V secondary windings that can be connected in parallel for a 4V output at higher current. The transformer can supply up to 5 amps continuously and has a maximum temperature rise of 115C. It can be mounted on a wall or DIN rail and complies with UL and CSA standards. The transformer measures 3.5" x 3" x 3.25" and weighs 2.5 lbs.
Cole-Parmer Digi-Sense Calibrated Liquid-In-Glass Thermometer; -50 to 50C, 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.
Thermco Products Inc Non-Mercury Fractional Degree Thermometer - Red Spirit | -1 to 61 °C
Non-Mercury Fractional Degree Thermometer has a range of -1 to 61 °C with 0.1°C divisions and a 420mm length.