Thermometer, Laboratory, Superior

Quick Answer: The Thermometer, Laboratory, Superior is a liquid-in-glass laboratory thermometer that the catalogue lists as its Superior version, alongside the standard laboratory thermometer. A superior laboratory thermometer covers the same kinds of liquid and gas measurement; what the Superior name adds in finish or tolerance is not defined in the title, so compare the details before ordering.

Choosing Between the Standard and Superior Versions

Glass laboratory thermometers are sold in versions that look alike but differ in how carefully the capillary bore is drawn, how the scale is marked and how closely readings are compared against a reference during manufacture. When a catalogue lists a standard item and one labelled Superior, the practical questions are: what tolerance is stated, is the scale etched and filled or printed, and what immersion depth is it made for. Put those questions side by side for this item and the laboratory thermometer.

Whichever version you choose, the most common fault in daily use is a split thread, where a bubble of gas separates part of the liquid column, often after transport or rapid cooling. It shows as a gap in the column and makes every reading wrong. It can usually be rejoined by cooling the bulb so the whole column retreats into it, or by holding the thermometer upright and giving it a few firm downward swings, then testing it at the ice point.

Glass thermometers break, and a lab should decide in advance how to deal with it. With a spirit filling, the glass is the main hazard: gather it into a sharps container and wipe up the coloured liquid. With mercury, isolate and ventilate the area and collect the droplets with a mercury spill kit, never a vacuum cleaner. Knowing the filling is therefore part of choosing a thermometer. Where finer readings over a narrow span are needed, the precision thermometer is the next step.

Specifications

Applications

• Practical examination benches where students’ readings are compared with an expected value
• Water-bath and incubator checks in microbiology and biochemistry labs
• Enthalpy of neutralisation and enthalpy of solution experiments in chemistry
• Density and viscosity experiments where liquid temperature is recorded with each measurement

Care & Handling

• Inspect the thread before each session and rejoin any split before taking readings.
• Store the thermometer upright in a rack, bulb down, which makes column separation less likely.
• Keep a spill kit suited to the filling near benches where glass thermometers are used.
• Never expose it to temperatures beyond the top of its scale.

Why Choose LabEquip

Labs that already stock the standard model sometimes add the Superior version for benches where they want it, after comparing specifications. LabEquip lists both in General Lab Products; ask for the tolerance and scale details on the contact page.

Frequently Asked Questions

What does Superior mean in the product name?

It is the name the catalogue gives this version to set it apart from the standard laboratory thermometer. The title does not define the difference, so ask for the tolerance, scale marking and immersion details and compare them before ordering.

How do I rejoin a split liquid thread?

Cool the bulb in ice so the whole column draws down and the gap closes, then let it warm slowly. Alternatively, hold the thermometer upright and give a few firm downward swings. Test it at the ice point afterwards.

Why do two thermometers in the same bath read differently?

Each thermometer has its own tolerance, and immersion depth, position in the bath and reading angle all add differences. Place both at the same depth, stir, read at eye level, and test each at the ice point to find its offset.

How should a broken spirit thermometer be cleaned up?

Collect the glass with a brush and dustpan, or with thick gloves, into a sharps or broken-glass container, then wipe up the coloured liquid with paper towels. Spirit fillings are far less hazardous than mercury, but the glass is sharp.

Why are thermometers stored upright?

Manufacturers commonly advise vertical storage because it reduces the chance of the liquid column separating, and a rack keeps the bulb from knocking against other items in a drawer.

Can this thermometer be used for oil and petroleum testing?

Petroleum test methods usually specify thermometers of a particular range, immersion and graduation. Use the thermometer named in the method; a general laboratory thermometer suits general measurements.

Last Updated: September 2026