Introduction
The ThermoPro TP357 Digital Hygrometer is designed to provide accurate and reliable temperature and humidity readings for your indoor environment. Featuring advanced Bluetooth technology, it allows for remote monitoring via a smart app, offering comfort indicators, real-time alerts, and extensive data storage capabilities. This manual will guide you through the setup, operation, and maintenance of your device to ensure optimal performance.

Figure 1: ThermoPro TP357 Digital Hygrometer and accompanying smartphone app interface.
Setup Guide
1. Battery Installation
The ThermoPro TP357 requires 2 AAA batteries (included). To install:
- Locate the battery compartment on the back of the device.
- Slide open the battery cover.
- Insert the 2 AAA batteries, ensuring correct polarity (+/-).
- Close the battery cover securely.

Figure 2: Rear view of the device with the battery compartment visible.
2. App Download and Connection
To utilize the smart features of your TP357, download the ThermoPro Sensor app:
- Scan the QR code in the product packaging or search for "ThermoPro Sensor" in your smartphone's app store (iOS or Android).
- Install and open the app.
- Ensure Bluetooth is enabled on your smartphone.
- Follow the in-app instructions to add your TP357 device. The app will automatically search for and connect to the hygrometer.
Video 1: Demonstrates the ThermoPro TP357 Bluetooth Indoor Thermometer and Humidity Meter, including app connectivity.
Operating Instructions
Comfort Face Indicators
The TP357 features intuitive comfort face icons on its display to quickly indicate the current air conditions:
- DRY (<30% RH): Indicates low humidity, potentially causing dry skin or static.
- COMFORT (30%~60% RH): Represents ideal humidity levels for comfort and health.
- WET (>60% RH): Signifies high humidity, which can lead to mold growth or discomfort.

Figure 3: Visual representation of comfort levels on the device display.
Bluetooth Range and Accuracy
The device utilizes enhanced Bluetooth technology, providing a stable and reliable connection up to 260 feet (80 meters) in open areas. It offers high accuracy for both temperature (±1°F/C) and humidity (±2%RH) readings, ensuring precise environmental monitoring.

Figure 4: Illustration of the 260ft Bluetooth coverage range.

Figure 5: Depiction of the accurate sensor technology within the device.
Smart App Features
The ThermoPro Sensor app enhances your monitoring experience with several key features:
- Real-time Data: View current temperature and humidity readings instantly.
- Customizable Alerts: Set specific temperature and humidity ranges. Receive instant phone notifications if levels fall outside your preset range, allowing for quick adjustments.
- Data Storage & Export: The app displays an easy-to-use graph with up to 2 years of historical data. You can export this data for detailed analysis, all without requiring user registration for enhanced privacy.
Video 2: Overview of the ThermoPro TP357's features, including its smart app capabilities.

Figure 6: Example of real-time alerts received via the ThermoPro app.

Figure 7: Illustration of the 2-year data storage and export function.
Convenient Mounting Options
The TP357 offers versatile placement options to suit your needs:
- Tabletop: Use the integrated kickstand for freestanding placement on any flat surface.
- Magnetic Back: Securely attach the device to metallic surfaces like refrigerators.
- Hanging Hole: Mount it on a wall using a screw or hook.

Figure 8: Various mounting options for the TP357.
Maintenance
Battery Replacement
When the battery indicator on the display or app shows low power, replace the batteries by following the installation steps in the Setup Guide (Section 2.1).
Cleaning
To clean your ThermoPro TP357, gently wipe the device with a soft, damp cloth. Do not use abrasive cleaners or immerse the device in water.
Troubleshooting
- No Display/Power: Ensure batteries are installed correctly with proper polarity. Replace with fresh AAA batteries if needed.
- App Connectivity Issues:
- Ensure Bluetooth is enabled on your smartphone and the device is within the 260ft range.
- Restart the ThermoPro Sensor app.
- If issues persist, try unpairing and re-pairing the device within the app.
- Check for app updates in your smartphone's app store.
- Inaccurate Readings:
- Ensure the device is placed in a stable environment, away from direct sunlight, heat sources, or strong drafts.
- Allow the device 10-15 minutes to stabilize after placement or significant environmental changes.
Specifications
| Feature | Detail |
|---|---|
| Model Number | TP-357-2 |
| Temperature Range | -4°F to 140°F (-20°C to 60°C) |
| Temperature Accuracy | ±1°F (±0.5°C) |
| Humidity Range | 10% to 99% RH |
| Humidity Accuracy | ±2% RH |
| Bluetooth Range | Up to 260 feet (80 meters) |
| Power Source | 2 x AAA batteries (included) |
| Mounting Options | Tabletop, Magnetic, Hanging Hole |
| Dimensions | 2.19"W x 11.16"H (Note: This dimension seems incorrect based on product images, likely a typo in source data. Actual device is compact.) |
| Item Weight | 2.47 ounces (70 Grams) |
Warranty and Support
ThermoPro products come with a standard warranty. For detailed warranty information, product registration, or technical support, please visit the official ThermoPro website or contact their customer service. Contact information can typically be found on the product packaging or on the ThermoPro website.
Online Resources:
- Official Website: www.thermopro.com
- Support Email: (Refer to website for current email)
- Phone Support: (Refer to website for current phone number)





