Introduction
Thank you for choosing the ThermoPro TP357 Digital Hygrometer Indoor Thermometer. This device is designed to provide accurate temperature and humidity readings for your indoor environment, helping you maintain optimal comfort and conditions. With its enhanced Bluetooth technology and smart app features, you can monitor your home's climate with ease and receive alerts when conditions fall outside your desired range.

The ThermoPro TP357 Digital Hygrometer, shown alongside its companion smartphone app, displays current temperature and humidity readings, offering a comprehensive view of your indoor environment.
Product Overview
Key Features:
- Face Icon Comfort Indicator: Quickly indicates DRY/COMFORT/WET air conditions.
- Enhanced Bluetooth Range: Up to 260ft/80m (no obstructions) for full home coverage.
- High Accuracy: Temperature accuracy of +/-1°F/°C and humidity accuracy of +/-2%.
- Smart App with Alerts: Set custom temperature and humidity ranges and receive instant phone notifications.
- 1 Year Data Storage: View historical temperature and humidity data with graphs.
Physical Features:
- Compact Size: Small and discreet, measuring approximately 2.2 x 2.1 inches.
- Large Digits: Easy-to-read display for quick glances.
- Versatile Mounting Options: Includes a hanging hole, desktop stand, and magnetic back.

The compact size of the ThermoPro TP357 is illustrated by comparing it to a standard egg, highlighting its small footprint.

The ThermoPro TP357 offers flexible placement with its hanging hole for wall mounting, integrated desktop stand, and magnetic back for attaching to metal surfaces like refrigerators.
Setup
Battery Installation:
The ThermoPro TP357 requires 1 AAA battery (included). Open the battery compartment on the back of the device, insert the battery with the correct polarity (+/-), and close the compartment securely.
App Download and Pairing:
- Download the ThermoPro Sensor app from the App Store (iOS) or Google Play Store (Android).
- Ensure Bluetooth is enabled on your smartphone.
- Open the ThermoPro Sensor app. The app will automatically search for and connect to your TP357 device.
- Once connected, you will see the current temperature and humidity readings on the app interface.
Device Placement:
Place the TP357 in your desired monitoring location. For accurate readings, avoid placing the device in direct sunlight, near heat sources (like radiators or appliances), or in areas with extreme drafts. The versatile mounting options allow for placement on a desktop, hanging on a wall, or attaching to a magnetic surface.

The ThermoPro TP357 offers an extended Bluetooth range of up to 260 feet, allowing you to monitor your home environment from various locations via the app.
Operating Instructions
Reading the Display:
- The large digits on the device display the current temperature and humidity.
- Press the °F/°C button on the back of the device to switch between Fahrenheit and Celsius temperature units.
Comfort Indicator:
The face icon on the display provides a quick visual indication of the comfort level based on humidity:
- DRY: Humidity below 30% (sad face).
- COMFORT: Humidity between 30% and 60% (smiley face).
- WET: Humidity above 60% (unhappy face).

The ThermoPro TP357 features a face icon comfort indicator that visually represents humidity levels: a sad face for Dry (<30%), a happy face for Comfort (30%-60%), and an unhappy face for Wet (>60%).
Using the Smart App:
The ThermoPro Sensor app offers advanced monitoring capabilities:
- Real-time Monitoring: View live temperature and humidity data directly on your smartphone. The device provides a fast 10-second response time for real-time data updates.
- Setting Alerts: Customize temperature and humidity alert ranges. If the readings go above or below your set thresholds, you will receive instant notifications on your phone, allowing for timely adjustments.
- Data Logging and Graphs: The app stores up to 1 year of historical data. You can view clear temperature and humidity graphs for 24 hours, 1 week, or 1 year, helping you analyze trends and make informed decisions about your environment.
- Data Export: Export historical data for further analysis or record-keeping.

The ThermoPro TP357 provides a 10-second fast response for real-time data, which is displayed on the app with clear temperature and humidity graphs.

The ThermoPro app allows users to set custom temperature and humidity alarms, providing real-time notifications if levels exceed or fall below the preset ranges.

The ThermoPro TP357 app supports data export, allowing users to transfer historical temperature and humidity data from their device to a computer for detailed analysis.
Official Product Video:
This official video from ThermoPro US provides an overview of the TP357 Bluetooth Indoor Thermometer Humidity Meter, showcasing its features and benefits.
Maintenance
Battery Replacement:
When the battery icon appears on the display, it's time to replace the AAA battery. Follow the battery installation steps in the Setup section.
Cleaning:
Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or immerse the device in water.
Storage:
If storing the device for an extended period, remove the battery to prevent leakage and damage.
Troubleshooting
No Display/Blank Screen:
- Check if the battery is inserted correctly with the right polarity.
- Replace the battery with a new AAA battery.
App Connectivity Issues:
- Ensure Bluetooth is enabled on your smartphone.
- Make sure the device is within the Bluetooth range (up to 260ft/80m without obstructions).
- Restart the ThermoPro Sensor app.
- Remove and re-insert the battery in the TP357 to restart the device.
Inaccurate Readings:
- Ensure the device is not placed in direct sunlight, near heat/cold sources, or in areas with strong drafts.
- Allow the device to stabilize for at least 30 minutes after placement or battery change.
- Compare readings with another calibrated thermometer/hygrometer if available.
Specifications
| Specification | Detail |
|---|---|
| Temperature Range | 32°F to 140°F (0°C to 60°C) |
| Temperature Accuracy | +/-1°F (+/-0.5°C) |
| Humidity Range | 10% to 99% |
| Humidity Accuracy | +/-2% |
| Bluetooth Range | Up to 260ft (80m) without obstructions |
| Power Source | 1 x AAA Battery (included) |
| Dimensions | 3"W x 0.2"H (approx. 2.2" x 2.1" actual unit size) |
| Item Weight | 1.23 ounces (35 grams) |

The ThermoPro TP357 features an accurate sensor with a temperature range of -4°F to 140°F (-20°C to 60°C) and a humidity range of 10%-99%, ensuring precise environmental monitoring.
Warranty & Support
Warranty Information:
ThermoPro products typically come with a 1-year warranty from the date of purchase. Please refer to the product packaging or the official ThermoPro website for specific warranty terms and conditions.
Customer Support:
For any questions, technical assistance, or warranty claims, please contact ThermoPro Customer Service. You can find contact information on the official ThermoPro website or through the ThermoPro Sensor app.
Website: www.thermopro.com





