1. Introduction
The Reer Mama Basal Thermometer is designed for precise measurement of basal body temperature (BBT). This device assists in determining fertile days, thereby increasing the probability of pregnancy. It features high measurement accuracy with two decimal places and includes a flexible tip for comfortable oral use. Measurement data can be automatically transferred to a free companion application via Bluetooth for easy documentation and cycle tracking.
2. Safety Information
- This thermometer is intended for measuring basal body temperature orally. Do not use for other purposes.
- Keep the device and its components out of reach of children. Small parts can be a choking hazard.
- The thermometer is not a contraceptive device. It only assists in identifying fertile periods.
- Consult a healthcare professional for any medical concerns or before making any decisions based on temperature readings.
- Do not expose the thermometer to extreme temperatures, direct sunlight, or strong impacts.
- Do not attempt to disassemble or repair the device yourself.
3. Package Contents
Please check that all items are present in the package:
- 1x Reer Mama Basal Thermometer
- 1x CR2032 Battery (pre-installed or separate)
- 1x Protective Cover
- 1x Instruction Manual
4. Product Overview
Familiarize yourself with the components of your Reer Mama Basal Thermometer:

Image 4.1: Components of the Reer Mama Basal Thermometer. This image highlights the protective cover, flexible measuring tip, the digital display showing a temperature with two decimal places, the Bluetooth transmission capability, and the automatic shut-off function.
- Flexible Measuring Tip: Ensures comfortable and secure placement during oral measurement.
- Digital Display: Shows temperature readings with two decimal places for high precision.
- Measurement Button: Used to power on/off the device and initiate measurements.
- Protective Cover: For hygienic storage and transport of the thermometer.
5. Setup
5.1 Battery Installation
The thermometer comes with a CR2032 battery. If not pre-installed, or for replacement:
- Gently twist and pull off the battery compartment cover located at the end of the thermometer.
- Insert the CR2032 battery with the positive (+) side facing up.
- Replace the battery compartment cover, ensuring it is securely closed.
5.2 App Download and Bluetooth Pairing
To utilize the data documentation feature, download the free companion app and pair your thermometer:
- Search for the 'Reer Mama' app in your smartphone's app store (iOS or Android) and install it.
- Enable Bluetooth on your smartphone.
- Open the Reer Mama app and follow the on-screen instructions to add a new device.
- Press the measurement button on the thermometer to turn it on. The app should detect the thermometer for pairing.
- Confirm the pairing request on your smartphone. The connection is fast and easy.

Image 5.1: Connecting the Reer Mama Basal Thermometer to the companion app via Bluetooth for automatic data transfer.
6. Operating Instructions
6.1 Taking a Basal Temperature Measurement
For accurate basal body temperature readings, follow these steps:
- Take your temperature immediately after waking up, before getting out of bed, eating, or drinking.
- Press the measurement button to turn on the thermometer. A short beep will sound, and the display will show the last measured temperature or 'Lo'.
- Place the flexible tip of the thermometer under your tongue, as far back as comfortable, and close your mouth.
- Hold the thermometer in place until a series of beeps indicates the measurement is complete. This typically takes a few minutes.
- Read the temperature displayed on the screen.

Image 6.1: Proper oral placement of the basal thermometer for measurement.
6.2 Data Transfer and Documentation
After measurement, the data can be transferred to the app:
- Ensure your smartphone's Bluetooth is active and the Reer Mama app is open.
- The thermometer will automatically attempt to transfer the measurement value to the app.
- Verify that the temperature reading appears in the app. The app allows for documentation of measurement values and determination of fertile days.

Image 6.2: Visual representation of temperature data documentation and fertility day determination using the thermometer and app.
6.3 Automatic Shut-off
The thermometer features an automatic shut-off function to conserve battery life. It will turn off automatically after a period of inactivity.
7. Maintenance and Care
Proper care ensures the longevity and accuracy of your thermometer:
- Cleaning: After each use, clean the thermometer tip with a soft cloth moistened with rubbing alcohol or a mild disinfectant. Do not immerse the entire thermometer in water.
- Storage: Store the thermometer in its protective cover in a cool, dry place, away from direct sunlight and extreme temperatures.
- Battery Replacement: Replace the CR2032 battery when the low battery indicator appears on the display. Follow the instructions in Section 5.1.
8. Troubleshooting
If you encounter issues with your Reer Mama Basal Thermometer, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermometer does not turn on. | Battery is dead or incorrectly inserted. | Check battery orientation or replace with a new CR2032 battery. |
| Cannot connect to the app via Bluetooth. | Bluetooth is off on phone, app not open, or thermometer not in pairing mode. | Ensure Bluetooth is enabled, open the Reer Mama app, and turn on the thermometer. Restart both devices if necessary. |
| Inaccurate or inconsistent readings. | Measurement taken incorrectly, external factors (e.g., movement, eating), or dirty tip. | Ensure proper measurement technique (Section 6.1). Clean the thermometer tip. Repeat measurement after 15 minutes if possible. |
| Display shows 'Err'. | Measurement error or device malfunction. | Turn off the thermometer and restart. If the error persists, contact customer support. |
9. Specifications
| Feature | Specification |
|---|---|
| Model Number | 31020 |
| Measurement Range | Not specified, typically 32.00°C to 42.99°C |
| Accuracy | ±0.05°C (for 35.00°C to 38.00°C) |
| Resolution | 0.01°C |
| Display Type | Digital |
| Connectivity | Bluetooth |
| Power Source | 1x CR2032 Battery (button cell) |
| Automatic Shut-off | Yes |
| Special Features | Flexible tip, free app for data tracking |
| Dimensions (Product) | Approx. 15 cm length |
| Weight | Approx. 60 grams (including battery) |
| Material | Plastic |
| Compliance | CE |
| Country of Origin | China |
10. Warranty and Support
This Reer Mama Basal Thermometer is manufactured to high-quality standards and complies with CE regulations. For warranty information, please refer to the specific terms provided at the point of purchase or contact Reer customer service directly. If you have any questions, require technical assistance, or need to report a defect, please contact the manufacturer or your retailer.
Manufacturer: Reer
Website: www.reer.de (Please check for local contact information)