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 Special application Hg, 0 deg./300 deg.C, 1.0C div, 125mm imm, 405mm
Precision mercury thermometer designed to be used in laboratory ovens. The immersion is 125mm. There is a stem enlargement at the 125mm immersion mark, so the thermometer is immersed correctly. The thermometer is also used in high temperature baths. It is accurate to N.I.S.T. tolerance and can be certified and taceable to N.I.S.T. Individually serialized
Cole-Parmer Digi-Sense Oven Verification Thermometer; 20 to 130C, PFA Coated
Accurately monitor temperatures in freezers, refrigerators, incubators, ovens, and other environments where stability is required. These thermometers are supplied in a media-filled unbreakable plastic bottle and can be removed from the bottle for recalibration. Use the magnetic attachment with pressure-sensitive backing to attach the bottle to a metal wall or door. Thermometers feature permanently fused markings, blue spirit liquid, white background glass; are also individually serial numbered. Include an statement of accuracy and a triangular-style antiroll fitting.
Grainger Digital Food Service Thermometer 1 L
The Taylor 14F309 digital food service thermometer is a pocket-sized thermometer designed for commercial kitchen use. It features a thin tip probe for faster response and easy insertion into food, an LCD display that shows the temperature reading, and preset temperature buttons that alert when minimum and maximum safe temperatures are reached. The thermometer is accurate to ±1°F from -40 to 450°F. It runs on a single LR44 button cell battery. Key features include the pocket clip, rotating display, and antimicrobial touch buttons. The Taylor 14F309 allows cooks to easily monitor food temperatures for food safety.
VWR International REFRIGERATOR/FRZER THERMOMETER
Refrigerator/Freezer Thermometer–50 to 70°C (–58 to 158°F)Bottle Probe
Cole-Parmer Digi-Sense Calibrated Liquid-In-Glass Thermometer; 30 to 124F, 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.