Clinical Thermometer For Body Temperature

Thermometer, Clinical

Medical-Grade Accuracy: Calibrated to within $\pm 0.1^{\circ}\text{C}$ °C in the critical human body temperature range, ensuring reliable detection of even low-grade fevers.

High-Speed Response (Digital): Delivers a stabilized reading in as little as 10 to 30 seconds, significantly reducing patient discomfort compared to older models.

$1.35

Quick Answer: The Thermometer, Clinical is a short glass thermometer with a narrow scale around human body temperature and a constriction above the bulb that holds the reading after the thermometer is removed. A clinical thermometer is used for oral or underarm readings at home, in school sick rooms and in human physiology practicals.

The Constriction: Why the Reading Stays Put

Just above the bulb, the capillary is deliberately narrowed. When the bulb warms, the expanding liquid is forced through this kink and up the scale. When the thermometer is removed and cools, the thread breaks at the constriction instead of sliding back, so the highest temperature stays visible until the thermometer is shaken down. That makes it a maximum-reading thermometer, and it is why it must be shaken before every use.

The oval or prism-shaped stem found on many glass clinical thermometers acts as a lens that magnifies the very fine thread when turned to the right angle. Its scale covers only a narrow band around normal body temperature, so it must never be used for hot liquids: heating beyond the top of the scale can burst the capillary. For bench temperatures, use a laboratory thermometer instead.

Older glass clinical thermometers were filled with mercury. Parties to the Minamata Convention on Mercury, adopted in 2013, committed to ending the manufacture, import and export of most mercury thermometers from 2020, and many schools and hospitals now use mercury-free glass or non-contact infrared thermometers. Ask about the filling if your institution has a mercury-free policy.

Specifications

Type	Clinical (maximum-reading) glass thermometer
Key feature	Constriction above the bulb holds the highest reading
Scale	Narrow band around human body temperature
Stem	Oval or prismatic lens-front stem is typical of this design
Use	Oral or underarm readings; physiology practicals
Liquid filling	Confirm at enquiry

Applications

Home and school sick-room checks of body temperature
Human physiology practicals recording body temperature before and after exercise
Teaching how a constriction turns an ordinary thermometer into a maximum thermometer
First-aid kits for hostels, camps and field trips

Care & Handling

Shake the column down below the scale before each use, gripping the top end firmly and keeping clear of hard surfaces.
Clean with cool soapy water or an alcohol wipe; never use hot water, which can exceed the scale and crack the tube.
Store it in its protective case, away from heat and sunlight.
If a glass thermometer breaks, keep people away from the fragments and clean up following your institution’s procedure for the filling liquid.

Why Choose LabEquip

Schools, hostels, first-aid rooms and physiology teaching labs buy these thermometers in sets for routine checks and practicals. LabEquip lists this model in General Lab Products; ask about fillings and quantities on the contact page.

Frequently Asked Questions

Why must a clinical thermometer be shaken before use?

The constriction stops the thread from falling back on its own, so the previous reading stays on the scale. Shake it with a sharp wrist movement until the thread is below the lowest graduation, or the new reading will be wrong.

How long should it stay in the mouth or armpit?

Long enough for the thread to stop rising, which for a glass thermometer is a few minutes. Follow the time given with the thermometer; underarm readings take longer and are usually a little lower than oral ones.

Can a clinical thermometer measure hot water or room temperature?

No. Its scale covers only a narrow band around body temperature. Hot water can drive the liquid beyond the scale and crack it, and room temperatures sit below the lowest graduation.

How should it be disinfected between users?

Wipe it from the top towards the bulb with an alcohol swab, or wash it in cool soapy water, then rinse and dry. Hot water or boiling is unsuitable. In shared settings, one thermometer per person is simpler.

What should be done if a mercury thermometer breaks?

Keep children and others away, ventilate the room and do not use a vacuum cleaner or broom, which spread mercury droplets. Collect the beads and glass carefully into a sealed container and dispose of it through the local hazardous-waste route.