1. Introduction
The Inkbird IBS-TH2 Plus Smart Thermometer is designed to monitor temperature and humidity indoors. It features a built-in sensor and supports an external temperature probe for versatile applications. Data can be accessed and managed via a free mobile application for iOS and Android devices, offering features like data logging, historical graphs, and customizable alarms.

Figure 1: Inkbird IBS-TH2 Plus Smart Thermometer with external probe connected.
2. Safety Information
Please read all safety instructions carefully before using the device. Failure to follow these instructions may result in damage to the device or personal injury.
- Do not expose the device to extreme temperatures outside its operating range.
- Keep the device away from water or other liquids, unless specifically designed for waterproof use (external probe is waterproof).
- Do not attempt to disassemble or modify the device.
- Use only specified battery types (2 AAA batteries).
- Keep batteries out of reach of children.
- Dispose of batteries and the device according to local regulations.
3. Product Overview
3.1 Components
- IBS-TH2 Plus Smart Thermometer Unit
- External Temperature Probe
- User Manual
- Warranty Card

Figure 2: Package Contents of IBS-TH2 Plus.
3.2 Key Features
- Bluetooth Connectivity: Maximum range of 98 ft (without obstacle) via Bluetooth connection.
- Dual Sensors: Built-in temperature & humidity sensor and an external waterproof temperature probe.
- Data Storage: Stores a maximum of 30,000 points of data on the device.
- Digital LCD Display: Shows current temperature, humidity, Bluetooth signal, and remaining battery power.
- App Integration: Supports graph viewing, accuracy calibration, high/low-temperature alarm notifications, and data export via the mobile application.
- Multi-Device Connection: Supports connection to multiple phones or reading multiple sensors with one cellphone.

Figure 3: Key Features of the IBS-TH2 Plus.

Figure 4: Product Dimensions.
4. Setup
4.1 Unboxing and Initial Setup
Follow these steps to set up your Inkbird IBS-TH2 Plus Smart Thermometer:
- Open the product packaging and remove all components.
- Locate the battery compartment on the back of the device.
- Insert 2 AAA batteries, ensuring correct polarity.
- Close the battery compartment cover securely. The LCD display should power on.
- If using the external temperature probe, plug its jack into the designated port on the side of the main unit.
Video 1: Unboxing and initial setup of the IBS-TH2 Plus, including battery installation and external probe connection.
4.2 App Installation and Connection
To utilize the smart features, download and connect to the Inkbird app:
- Search for "Engbird" or "Inkbird" in your device's app store (iOS App Store or Google Play Store) and download the application.
- Ensure Bluetooth is enabled on your smartphone.
- Open the Inkbird app and follow the on-screen instructions to add a new sensor.
- Place the IBS-TH2 Plus device near your phone during the scanning process for optimal connection.
- Once connected, you can view real-time temperature and humidity data, adjust settings, and set alarms.

Figure 5: Controlling the device from your phone via Bluetooth connection.
5. Operating Instructions
5.1 Reading the Display
The LCD screen on the IBS-TH2 Plus displays the current temperature and humidity readings. It also shows the Bluetooth connection status and battery level.

Figure 6: Real-time monitoring with built-in and external sensors.
5.2 Using the Mobile Application
The mobile application provides advanced functionalities:
- Real-time Monitoring: View live temperature and humidity data.
- Historical Data: Access graphs of historical temperature and humidity data. The device stores up to 30,000 data points.
- Data Export: Export historical data in CSV format for analysis.
- Alerts: Set customizable high/low temperature and humidity alarms. The app will notify you if readings fall outside your set range.
- Calibration: Calibrate temperature and humidity readings for improved accuracy.

Figure 7: Diagram and Data Export features in the app.
5.3 External Probe Usage
The external waterproof temperature probe extends the device's utility:
- Insert the external probe into environments where the main unit cannot be placed, such as refrigerators, freezers, or liquids.
- The device will automatically switch to display the external probe's temperature reading when connected.

Figure 8: Diverse applications for the Smart Thermometer.
6. Maintenance
6.1 Cleaning
To clean the device, simply wipe it with a clean, damp cloth. Do not use abrasive cleaners or immerse the main unit in water.
6.2 Battery Replacement
When the battery indicator on the LCD display shows low power, replace the 2 AAA batteries. Ensure the device is powered off before replacing batteries and insert them with correct polarity.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on. | Dead or incorrectly installed batteries. | Replace batteries with new AAA batteries, ensuring correct polarity. |
| Cannot connect to the app via Bluetooth. | Device is out of Bluetooth range (max 98 ft without obstacles); Bluetooth is off on phone; app issue. | Move the device closer to your phone. Ensure Bluetooth is enabled on your phone. Restart the app or your phone. |
| Inaccurate readings. | Sensor obstruction; need for calibration. | Ensure sensors are clear. Use the app's calibration feature to adjust readings. |
| No alerts received from the app. | App not running in the background; notification settings disabled. | Ensure the app is open or running in the background. Check your phone's notification settings for the Inkbird app. |
| Display only shows external probe reading. | This is normal behavior when the external probe is connected. | The device prioritizes the external probe reading when connected. To see internal sensor readings, disconnect the external probe. |
8. Specifications
- Model: IBS-TH2 Plus
- Product Dimensions: 1.06 x 0.79 x 1.06 inches; 1.1 Pounds
- Batteries: 2 AAA batteries required
- Manufacturer: Inkbird
- Special Feature: Waterproof (external probe)
- Color: White
- Included Components: Temperature and humidity sensors; external temperature probe
- Outer Material: Acrylonitrile Butadiene Styrene
- Specification Met: FCC
- Display Type: LCD
- Connectivity Technology: Bluetooth
- Product Care Instructions: Wipe Clean
- Temperature Sensor Range (Built-in): -40 to 140 Fahrenheit (-40 to 60 Celsius)
- Humidity Sensor Range (Built-in): 0%RH to 99%RH
- Temperature Sensor Range (External Probe): -40 to 257 Fahrenheit (-40 to 125 Celsius)
9. Warranty & Support
9.1 Warranty Information
The Inkbird IBS-TH2 Plus Smart Thermometer comes with a 12-month warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accident, unauthorized modification, or improper installation.
Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For technical support, troubleshooting assistance, or warranty inquiries, please contact Inkbird Customer Service. Refer to the contact information provided on the official Inkbird website or your product packaging.
Note: Specific contact details are subject to change. Always refer to the latest information on the manufacturer's official channels.





