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Inclusion Thermometer
Enclosed-Scale Protection: The measurement scale is housed inside a vacuum-sealed or gas-filled outer jacket, protecting it from chemical erosion, moisture, and mechanical wear.
High-Visibility Opal Scale: Often features an opal-glass or high-contrast white backing behind the capillary, providing a "background" that makes the mercury or spirit column significantly easier to read.
$9.87
Quick Answer: An inclusion thermometer, also called an enclosed-scale thermometer, is a liquid-in-glass thermometer in which the fine capillary and a separate graduated strip lie side by side within a sealed outer glass tube, with only the bulb end exposed. The enclosed scale cannot be worn away or stained by the liquids it is used in.
Enclosed Scale Compared with a Solid-Stem Thermometer
On an ordinary solid-stem laboratory thermometer, the scale is etched into the outside of a thick glass rod and filled with pigment. Hot acids, alkalis and repeated washing slowly remove the pigment, and the markings become hard to read. An inclusion thermometer places the scale behind glass: a white or opal strip carries the graduations, the fine capillary lies in front of it, and an outer tube seals both in. The graduations stay crisp, and the white background makes a thin liquid column easy to see.
The construction has two practical consequences. The outer envelope makes the thermometer thicker, so it needs a wider opening in a stopper or adapter. And because the scale strip is a separate part, it must stay in its correct position relative to the capillary. Many enclosed-scale thermometers carry a reference mark to show whether the strip has moved; check it before relying on a reading after a knock.
The name comes from the German term Einschlussthermometer, and the design is widely used in European laboratory practice for water baths, incubators, oil baths and general work. LabEquip also lists a thermometer of enclosing type; the range, immersion depth and filling liquid of this item are confirmed on request.
Specifications
| Type | Enclosed-scale liquid-in-glass thermometer |
| Scale | Separate strip sealed inside an outer glass envelope |
| Advantage | Graduations protected from chemicals, abrasion and fading |
| Consideration | Thicker than a solid-stem thermometer; check scale position |
| Typical uses | Water baths, incubators, oil baths, general lab work |
| Range, immersion depth and filling | Confirm at enquiry |
Applications
- Monitoring water baths and oil baths in teaching and routine labs
- Reading incubator and drying cabinet temperatures
- Work in corrosive liquids that would erode an etched stem scale
- Situations where a clear white scale background helps quick reading
Care & Handling
- Check that the scale strip has not shifted against the capillary, using any reference mark on the inclusion thermometer.
- Immerse it to the depth it was calibrated for; the outer envelope does not change this requirement.
- Clean the envelope with detergent solution and avoid scratching the glass over the scale.
- Store it in a rack or case, never loose, and inspect the envelope for cracks.
Why Choose LabEquip
Laboratories that keep thermometers permanently in baths, incubators or corrosive liquids choose enclosed-scale designs because the markings last. LabEquip lists this thermometer in its General Lab Products range with the glass thermometer for petroleum use for method-specific testing; contact LabEquip with the range you require.
Frequently Asked Questions
What does inclusion mean in the name?
It refers to the scale being included, or enclosed, inside the thermometer’s outer glass tube. The name is a translation of the German term for this design.
What is the advantage over a solid-stem thermometer?
The graduations sit behind glass, so acids, alkalis, solvents and repeated washing cannot wear or stain them. The white scale strip also makes the liquid column easier to read.
Can the scale move inside the thermometer?
It can if the thermometer is badly knocked, because the scale strip is a separate part. Many designs carry a reference mark that shows whether the strip is still correctly aligned.
Will it fit my thermometer adapter?
Enclosed-scale thermometers are thicker than solid-stem types because of the outer envelope. Check the diameter against your stopper, adapter or thermometer pocket before ordering.
Is this the same as an enclosing type thermometer?
Both names describe a thermometer with its scale enclosed in an outer glass tube. LabEquip lists them separately, so compare range and length when choosing between them.
How should it be cleaned?
Wash it with warm water and laboratory detergent and rinse it. There is no pigment on the outside to lose, but avoid scouring powder, which scratches the envelope over the scale.
Last Updated: September 2026
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