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A manual oral clinical thermometer, also known as a mercury-in-glass or mercury-free glass thermometer, is a traditional medical device used to measure human body temperature by placing it under the tongue.
Physical Description and Parts
Manual clinical thermometers are typically constructed from high-quality glass and consist of the following components:
- Bulb: The rounded, thin-walled tip at one end that contains a liquid, historically mercury or a modern non-toxic alternative like gallium (Galinstan). It absorbs heat directly from the body.
- Capillary Tube: A very fine, hollow tube running through the center of the thermometer stem where the liquid rises as it expands.
- Kink (Constriction): A small, narrow bend in the tube located just above the bulb. It prevents the liquid from falling back into the bulb instantly, allowing the highest reading to remain stable even after removal from the mouth.
- Glass Stem: The main body that protects the capillary tube and features the temperature scale.
- Scale: Markings printed on the glass indicating degrees in Celsius (35°C to 42°C) and/or Fahrenheit (94°F to 108°F)
Key Features
- Precision: These devices are noted for high accuracy within a narrow range specifically calibrated for body temperature.
- Manual Reset: Unlike digital models, they require a physical “shake down” to reset the liquid below the initial markers before each use.
- Battery-Free: They rely solely on thermal expansion, ensuring they are always ready for use without needing power or charging
Recommended Products
Based on expert availability and safety standards, the following manual thermometers are common
Flipkart
Described by Orancle Care as a mercury-free option that provides accurate readings for oral, underarm, and rectal use. It includes a protective blue case.
Usage Instructions
- Preparation: Wash with cool soapy water or an antiseptic solution; never use hot water, as it may break the glass.
- Reset: Firmly grasp the end opposite the bulb and shake it with a sharp flick of the wrist until the liquid falls below 35°C (95°F).
- Measurement: Place the bulb under the tongue in the posterior sublingual pocket. Close the mouth firmly and wait approximately 3 to 5 minutes for a stable reading.
- Reading: Hold the thermometer at eye level and rotate it slightly until the column of fluid is visible against the scale.
Additional information
| Weight | 0.50 kg |
|---|---|
| Dimensions | 7 × 2 × 7 cm |
HSN Code: 90251110
Return Available: No
Warranty: no
Country of Origin: INDIA
Drug License Required: No
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