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User Manual for Sencor SBT 133 Digital Thermometer
Quick guide for the Sencor SBT 133 digital thermometer. Learn how to use, measure temperature (oral, rectal, axillary), replace the battery, and clean the device safely.
Table of contents
Quick guide from the manual
The Sencor SBT 133 is a digital thermometer designed for domestic use. Before first use, remove the protective film from the display. The device is operated via a single button. Always ensure the thermometer is cleaned before and after each use.
Safety instructions
- Do not expose the thermometer to direct sunlight, high temperatures, or excessive humidity.
- The device is not waterproof; do not immerse it in water or other liquids.
- Do not attempt to disassemble the device, except for battery replacement.
- Temperature measurement should always be performed under adult supervision.
- Keep batteries out of reach of children.
How to use
To turn on the thermometer, press the power button. The display will briefly show all elements and the last measured value (indicated by 'M'). Once the display shows 'Lo' and the measurement symbol flashes, the device is ready for use.
Measurement methods
- Oral: Place the tip under the tongue, close the mouth, and breathe regularly through the nose. Keep the thermometer in the same position.
- Rectal: This is the most accurate method. Carefully insert the tip into the rectum to a maximum depth of 1.5 cm.
- Axillary: Place the tip in the deepest part of the armpit and press the arm firmly against the body.
The measurement takes approximately 30 to 60 seconds. The device will emit a sound signal when the measurement is complete. The thermometer turns off automatically after 10 minutes of inactivity.
Battery replacement
When the battery symbol appears on the display, the battery is low and needs replacement. Use a micro-alkaline battery type LR41 (1.55V). Unscrew the battery compartment cover, replace the battery ensuring the '+' sign faces downwards, and secure the cover with the screw.
Cleaning and maintenance
Clean the thermometer before and after each use using a soft cloth moistened with a disinfectant (e.g., 70% ethanol). Do not sterilize by boiling. Do not use thinners or chemical solvents for cleaning.
Technical specifications
- Measurement range: 32–43°C
- Accuracy: ±0.1°C (in range 35.5–42°C)
- Protection: IPX0 (not waterproof)
- Power supply: LR41 (1.55V)
- Battery life: Min. 200 hours of continuous operation
Manufacturer information
Sencor
Practical help
Common problems
Display shows 'Lo'
This indicates the thermometer is ready for measurement (ambient temperature is below 32°C).
Display shows 'Hi'
The measured temperature is above 43°C.
Display shows 'M'
This indicates the device is recalling the last measured value from memory.
Before use
- Remove the protective film from the display.
- Ensure the battery is installed correctly.
- Clean the tip with a disinfectant.
- Check that the 'Lo' symbol is flashing before starting measurement.
Specs in practice
- Measurement Range
- 32–43°C
- Battery Type
- Micro-alkaline battery LR41 (1.55V).
Images and diagrams
- The device features a single button for power and memory recall.
- The tip is the sensor area for temperature measurement.
Model compatibility
- For domestic use only.
- Not waterproof; do not immerse in water.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.