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 MABIS Digital Thermometer, Digital
The MABIS Digital Thermometer is a digital thermometer designed for oral, rectal or underarm temperature measurement. It features a flexible tip for comfort, an easy-to-read LCD display, auto-off to conserve battery life, and a memory recall of the last temperature taken. The thermometer measures temperatures from 89.6 to 109.0°F with ±0.2°F accuracy. It is compact, lightweight, and runs on one LR41 button cell battery (included). This digital thermometer is ideal for home use and provides fast, accurate temperature readings.
Chemglass Life Sciences Thermometer, Non-Mercury, Total Immersion, -20°C to 150°C, 305mm OAL
Thermometer, Non-Mercury, Total Immersion, -20¿C to 150¿C, 305mm OAL. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. All ranges have 1¿ subdivisions. Thermometer has a white back and a 6 to 7mm outer diameter.
Thermco Products Inc NIST compliant, factory certified glass Spirit thermometer, -1 deg./51 deg.C, 0.2C div, 76mm imm, certified at 0 deg.C, 10 deg.C, 20 deg.C, 30 deg.C, 37 deg.C, 40 deg.C, 50 deg.C, 105 deg.C, 400mm
Thermco Certified Thermometers are used in temperature verification and calibration procedures. These instruments can be used to calibrate Liquid-In- Glass, RTD, Thermistors, Thermocouples, and Bi-Metal Thermometers. The certified thermometers are carefully inspected to insure they conform to exact specifications and are certified against NlST standards. Each thermometer is furnished with a document proving traceability and a felt-lined leatherette storage case.
Chemglass Life Sciences Thermometer, Non-Mercury, 10/18 Joint, 25mm Immersion, -10C to 250C
Thermometer, Non-Mercury, 10/18 Joint, 25mm Immersion, -10C to 250C. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. Thermometer has a white back, a 6 to 7mm outer diameter, and a standard taper 10/18 inner ground joint. All ranges have 1° subdivisions. Immersion is measured from the bottom of the joint to the bottom of non-mercury bulb.