Introduction
The DOOMAY Mini Hygrometer Indoor Thermometer is a compact and accurate device designed to monitor temperature and humidity levels in various indoor environments. Its clear LCD display, quick response time, and versatile placement options make it ideal for use in baby rooms, cellars, reptile incubators, offices, and greenhouses. This manual provides detailed instructions for setting up, operating, and maintaining your device to ensure optimal performance.

Image: Two DOOMAY Mini Hygrometer Indoor Thermometers, showcasing their compact design and clear digital display of temperature and humidity.
What's in the Box
Upon opening your DOOMAY Mini Hygrometer package, you should find the following items:
- 2 x DOOMAY Mini Hygrometer Indoor Thermometers
- 1 x CR2032 Battery (pre-installed or included separately)
- 1 x 3M Adhesive Pad
Features
The DOOMAY Mini Hygrometer Indoor Thermometer is equipped with several features to provide accurate and convenient environmental monitoring:
- High Accuracy: Monitors environment reliably every 10 seconds with 11 sensitive vents. Temperature accuracy: ±1℃ (0-40℃), ±2℃ (40-60℃). Humidity accuracy: ±3-5% RH.
- Wide Measuring Range: Temperature from -9.9℃ to 60℃ (14.2℉ to 140℉), humidity from 10% to 99%.
- Compact Size: Mini rectangle design (approximately 2 inch * 1.34 inch * 0.51 inch) for portability and space-saving.
- Clear LCD Screen: Large, easy-to-read digits.
- Comfort Indicator: Smiley face and sad face icons reflect humidity and temperature comfort levels.
- ℃/℉ Switch: Easily switch between Celsius and Fahrenheit display.
- Versatile Placement: Can be placed on a tabletop or mounted using the included 3M adhesive pad.

Image: Overview of the DOOMAY Mini Hygrometer's key features, including temperature and humidity monitoring, comfort indicator, clear digits, and Celsius/Fahrenheit switch.

Image: A detailed chart explaining the comfort level indicator, showing how different combinations of temperature and humidity are represented by face icons on the display.
Setup
- Battery Installation: The device typically comes with a CR2032 battery pre-installed. If not, or if you need to replace it, open the battery cover on the back of the unit. Insert the CR2032 battery with the positive (+) side facing up. Close the battery cover securely.
- Power On: The device will automatically power on and begin displaying temperature and humidity readings once the battery is correctly installed.
- Placement:
- Tabletop Placement: The compact design allows the unit to stand freely on any flat surface, such as a desk, shelf, or nightstand.
- Surface Mount: For wall or vertical surface mounting, use the provided 3M adhesive pad. Ensure the surface is clean and dry before applying the adhesive. Press firmly for a few seconds to secure.

Image: Illustration of the two primary placement options for the hygrometer: freestanding on a surface or mounted using the included adhesive.

Image: A detailed diagram highlighting the various parts of the hygrometer, including the display elements, battery compartment, and the Celsius/Fahrenheit switch button.
Operating Instructions
- Reading the Display: The large LCD screen displays the current temperature (in Celsius or Fahrenheit) and relative humidity percentage. The readings update approximately every 10 seconds.
- Switching Temperature Units (℃/℉): Locate the small button inside the battery compartment. Use a small, pointed object (like a pen tip) to press this button to toggle between Celsius (℃) and Fahrenheit (℉) display modes.
- Understanding the Comfort Indicator: The face icon on the display provides a quick visual indication of the comfort level based on temperature and humidity:
- Smiley Face (😊): Indicates comfortable conditions.
- Neutral Face (😐): Indicates acceptable but not ideal conditions.
- Sad Face (😞): Indicates uncomfortable conditions (too dry or too humid/hot/cold).
Maintenance
- Cleaning: Wipe the device gently with a soft, dry cloth. Do not use abrasive cleaners or immerse the device in water.
- Battery Replacement: When the display dims or stops working, it's time to replace the CR2032 battery. Follow the battery installation steps in the 'Setup' section. Ensure proper polarity.
- Storage: If storing the device for an extended period, remove the battery to prevent leakage. Store in a cool, dry place.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display or dim display | Low or dead battery; incorrect battery installation. | Replace the CR2032 battery. Ensure it is inserted with correct polarity (+ side up). |
| Inaccurate temperature/humidity readings | Sensor obstruction; device placed in extreme conditions; device malfunction. | Ensure air vents are not blocked. Move the device away from direct sunlight, heat sources, or strong drafts. Allow 30 minutes for readings to stabilize after moving. If issues persist, contact customer support. |
| Cannot switch between ℃/℉ | Button not pressed correctly. | Ensure the battery cover is open and use a small, pointed object to firmly press the ℃/℉ switch button located inside the battery compartment. |
Specifications
| Parameter | Value |
|---|---|
| Model | B0CSFLQZBH |
| Brand | DOOMAY |
| Temperature Range | -9.9℃ to 60℃ (14.2℉ to 140℉) |
| Temperature Accuracy | ±1℃ (0-40℃), ±2℃ (40-60℃) |
| Humidity Range | 10% to 99% RH |
| Response Time | 10 seconds |
| Dimensions | Approx. 2 inch x 1.34 inch x 0.51 inch (5.08 cm x 3.4 cm x 1.3 cm) |
| Battery Type | CR2032 (1 per unit) |
| Mounting Type | Tabletop, Surface Mount |
Warranty and Support
DOOMAY products are designed for reliability and performance. Your Mini Hygrometer Indoor Thermometer comes with:
- 18-Month Warranty: Enjoy peace of mind with an 18-month warranty covering manufacturing defects.
- 30-Day Return & Refund & Replacement: If you are not satisfied with your purchase within 30 days, you may be eligible for a return, refund, or replacement.
- After-Sales Service Guarantee: DOOMAY is committed to providing convenient service and support.
For any questions, technical assistance, or warranty claims, please contact DOOMAY customer support through the retailer's platform or the official DOOMAY website. Please have your product model number (B0CSFLQZBH) and purchase details ready when contacting support.


