General Purpose Glass Thermometer, Green Filled, 300 mm

Description

The General Purpose Glass Thermometer, Green Filled, also known as a laboratory glass thermometer, green spirit thermometer or partial immersion thermometer, is designed for measuring temperatures during routine laboratory experiments and educational science activities. Manufactured under the Initial™ Brand by Brannan, this thermometer combines a traditional liquid-in-glass measuring system with a clearly printed Celsius scale. It provides a straightforward method of observing temperature changes without requiring batteries, digital displays or electronic measuring equipment.

The thermometer measures temperatures from -10°C to +110°C, making it suitable for heating and cooling experiments, liquid temperature investigations and general laboratory temperature monitoring. Its 1.0°C scale divisions allow users to read and record temperatures directly. The green non-mercury liquid filling expands and contracts in response to temperature changes. As the liquid moves through the narrow glass capillary, its position against the graduated scale indicates the measured temperature. The green liquid column provides a visible temperature indication, helping students practise reading laboratory thermometers and recording measurements during science experiments.

Measuring 300 mm in length and approximately 6.5 mm in diameter, the thermometer offers a longer glass body than the 200 mm variation. Its extended scale provides additional spacing for displaying graduations and supports convenient reading during laboratory procedures. The instrument features a 76 mm partial immersion design, meaning the thermometer should be immersed to the specified depth when measuring temperature. The remaining glass stem stays above the liquid, allowing the scale to be viewed. Correct immersion is important because inserting the thermometer deeper or shallower than its designated immersion mark can introduce measurement errors. Users should follow the manufacturer’s instructions when taking readings.

The manufacturer specifies an accuracy of ±1.5°C at 35°C. This accuracy value differs from the 1.0°C scale divisions, which indicate graduation spacing rather than the instrument’s measurement tolerance. A moulded triangular non-roll top helps reduce the likelihood of the thermometer rolling across a laboratory bench. This practical feature supports classroom handling, although the glass construction remains fragile and should be protected against impact. The thermometer is suitable for water bath monitoring, chemistry experiments, thermal investigations and routine liquid temperature measurements where its range, immersion requirements and accuracy are appropriate.

For reliable measurements, immerse the thermometer to the indicated depth, allow the liquid column to stabilise and read the scale at eye level. Avoid contact between the sensing bulb and the container walls where this could influence the result. Safety Precautions: Handle the glass thermometer carefully and avoid sudden temperature changes, impacts or exposure to direct flames. Do not exceed its specified measuring range. If broken, follow laboratory procedures for collecting glass fragments and cleaning the filling liquid. Each unit is supplied as one Initial™ Brand Green Filled Glass Thermometer with a reusable protective storage tube. A separate calibration certificate is not confirmed as included.

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