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 General lab Hg thermometer, -10 deg./400 deg.C, 2 deg.C div, 76mm imm, 405mm
Mercury filled thermometer, yellow back tubing, with toughened bulbs. Suspension ring for hanging, vertical numbering. Individual serial numbered. Packed in non-roll square tubing. Permanent markings.
Thermco Products Inc Precision lab Hg thermometer, Fractional degree, -1 deg./201 deg.C, 0.2 deg.C div, 76mm imm, 610mm
High precision mercury SAMA thermometer that meet or exceed the specifications of the American National Standards Institute. Specifications approve by N.I.S.T. and ASTM. Individually serialized and permanetly marked. Made with precision yellow backed tubing. SAMA No. CP50
Thermco Products Inc 35-200C 180MM SAFETYCOAT THERM
35/200C x 1.0C, Total immersion, Spirit with Safety Coat
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.
VWR INTERNATIONAL INC Oven Thermometer (with 30 mL bottle of Glass Beads)
Range: +20 to 130°C, Length: 145 mm, Accuracy: ±1.5°C; ±2°C above 100°C, Divisions: 1°C
Market Lab Bottle Thermometers, ML20101, 3ml
The MLI ML20101 Bottle Thermometer is a glass thermometer with a blue alcohol-filled column and white numbers for easy reading. It has a temperature range of -20 to 110°F/-28 to 43°C and is 8 inches long. This thermometer is designed for use in liquids and attaches to bottles, carboys, and tanks with a stainless steel clip. It can be fully submerged and is ideal for monitoring fermentation or controlling bath temperatures. The thermometer has 1° graduations for precise temperature measurement. It is made in the USA and is lead-free and non-toxic.
Cole-Parmer Traceable Jumbo Refrigerator/Freezer Thermometer with Calibration; 1 Bottle Probe
Thermometer is designed for monitoring freezers, water baths, heating blocks, incubators, refrigerators and other general-purpose applications. Display simultaneously shows maximum, minimum, and current probe temperatures. Min/max monitors high/low readings for any time period. Alarm is programmable in 1 increments. The 10-ft (3 m) micro-cable with solid-state probe permits doors to close on it. Traceable Products have an individually-numbered Traceable Certificate provided with each unit, that assures accuracy from our ISO/IEC 17025:2017(1750.01) calibration laboratory accredited by A2LA. It indicates traceability of measurements to the SI units through NIST or other recognized national measurement institutes (NMI) that are signatories to the CIPM Mutual Recognition Agreement. Each product goes through an intense vetting process before it can carry the Traceable name, thus saving you both time and money by not having to calibrate separately.