General Purpose Glass Thermometers, 305 mm, White Backed, Spirit Filled

Description

The General Purpose Glass Thermometers, 305 mm, White Backed, Spirit Filled, also known as laboratory spirit thermometers, liquid-in-glass thermometers or laboratory immersion thermometers, are designed for routine temperature measurements in educational, research and general laboratory environments. Manufactured by Brannan UK, these thermometers feature red spirit filling and clearly graduated Celsius scales. Their traditional liquid-in-glass construction provides a straightforward method of measuring temperature without batteries or electronic equipment. The range includes four temperature options: -20°C to +110°C, -10°C to +50°C, -10°C to +110°C and -10°C to +150°C. Each variation offers a specific measuring range, graduation interval and immersion requirement.

The -20°C to +110°C thermometer features 1.0°C scale divisions and a total immersion design. It is suitable for temperature investigations where the thermometer can be immersed according to the manufacturer’s total immersion requirements. The -10°C to +50°C variation features finer 0.5°C graduations and a 76 mm partial immersion depth. Its narrower measuring range makes it suitable for experiments requiring smaller scale intervals within moderate temperatures. The -10°C to +110°C and -10°C to +150°C variations feature 1.0°C scale divisions and 76 mm partial immersion. The extended +150°C upper limit provides an additional option for suitable laboratory heating experiments.

All four thermometers measure 305 mm in length and 6.5 mm in diameter, providing a slim glass construction suitable for compatible laboratory vessels. Their elongated stems allow convenient reading of the temperature scale. The red spirit filling expands and contracts with temperature changes. As the liquid moves through the narrow capillary, its position against the printed Celsius graduations indicates the measured temperature. The white-backed scale improves contrast between the red liquid column and graduation markings, helping students and laboratory personnel identify temperature readings during practical procedures.

Correct immersion is important for measurement accuracy. The three partial immersion models require a 76 mm immersion depth, while the total immersion variation must be immersed according to its designated calibration conditions. A non-roll end cap with suspension ring helps prevent rolling across laboratory benches and allows convenient storage in a compatible holder. The glass body should still be handled carefully to avoid breakage. These thermometers support heating and cooling investigations, water bath monitoring, liquid temperature measurement and general chemistry experiments. Users should select the appropriate temperature range and immersion type for each procedure.

For reliable readings, position the thermometer correctly, allow the liquid column to stabilise and read the scale at eye level. Avoid contact between the sensing bulb and container surfaces that could affect the measurement. Safety Precautions: Handle glass thermometers carefully and avoid impacts, sudden temperature changes and direct flame contact. Do not exceed the specified temperature range. Follow laboratory procedures for collecting broken glass and cleaning spilled filling liquid. Each selected variation is supplied as one Brannan Spirit Filled Glass Thermometer in an individual protective tube. Calibration certification is available separately on request.

LabChoice Australia supplies laboratory glass thermometers and temperature measurement equipment for secondary schools, universities, research facilities and science teaching laboratories across Australia.