Introduction
The Tzone TempU03 is a versatile temperature and humidity USB data logger designed for monitoring and recording environmental conditions. Its compact design and user-friendly interface make it suitable for various applications, including storage facilities, laboratories, greenhouses, and residential use. This device accurately tracks temperature and humidity levels over time, ensuring optimal conditions. The integrated LCD provides real-time readings, and USB connectivity facilitates seamless data transfer for analysis and record-keeping. This manual provides essential information for the proper setup, operation, and maintenance of your TempU03 data logger.
Product Features
- Compact Design: This multi-use temperature and humidity data logger features a sleek, portable design for convenient monitoring.
- Clear Display: The large LCD screen displays temperature and humidity readings in real-time, allowing for easy data tracking.
- USB Connectivity: Simply connect the device to a computer via USB to access recorded data and configure settings.
- Wide Range: Capable of measuring temperatures from -40°C to 70°C and humidity levels from 0% to 100% RH.
- Long Battery Life: Powered by a replaceable CR2032 coin cell battery, ensuring extended operation without frequent battery changes.
Device Overview

Figure 1: Front view of the Tzone TempU03 data logger, showing the LCD screen and control buttons.

Figure 2: Detailed diagram of the TempU03, highlighting the LCD screen elements (Alarm, Battery Life, Temp Unit, Temperature Value), Status Indicator Light (OK, Alarm), Start/Scroll/Mark button, Stop button, and USB Port.
The TempU03 features a clear LCD display for real-time data. It includes an 'OK' status indicator and an 'ALARM' indicator. Control is managed via 'Start/Scroll/Mark' and 'Stop' buttons. A USB port is located at the bottom for data transfer and configuration.
Setup
1. Battery Installation
The TempU03 comes with a pre-installed CR2032 coin cell battery. If replacement is needed:
- Locate the battery compartment on the device.
- Open the compartment cover.
- Insert a new CR2032 battery, ensuring correct polarity (+/-).
- Close the battery compartment securely.
2. Software Installation (Optional for Advanced Configuration)
While the device can generate basic reports without software, advanced configuration (e.g., logging interval, alarm limits, temperature unit) requires the Tzone software. Refer to the included instructions or the manufacturer's website for software download and installation. It is recommended to install the software on a dedicated or test computer due to potential security warnings reported by some users.

Figure 3: Screenshot illustrating the Tzone software interface for setting parameters such as logging interval, start mode, and comparing multiple data charts.
Operating Instructions
1. Starting a New Data Run
To begin recording data:
- Press and hold the 'Start/Scroll/Mark' button for approximately 3 seconds until the 'OK' indicator light flashes.
- The device will begin logging data according to its current configuration.
- Note: Starting a new data run will erase any previously stored data on the device. Ensure all necessary data has been downloaded before initiating a new run.
2. Stopping Data Logging
To stop recording data:
- Press and hold the 'Stop' button for approximately 3 seconds.
- The device will cease logging, and the 'OK' indicator light will turn off.
3. Viewing Real-time Data
The LCD screen continuously displays the current temperature and humidity readings. Press the 'Start/Scroll/Mark' button briefly to cycle through different display modes or mark data points during logging.
4. Data Download and Report Generation
To retrieve recorded data:
- Connect the TempU03 to a computer's USB port.
- The device will appear as a removable drive.
- Automatically generated PDF and CSV files containing the logged data from the last measurement run will be accessible.
- For more detailed analysis and custom reports, use the Tzone software.

Figure 4: Illustration of the automatic report generation feature, showing the TempU03 connected to a laptop and displaying PDF and CSV file icons, indicating data can be accessed without additional software.
Maintenance
1. Cleaning
Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or immerse the device in water.
2. Battery Replacement
When the battery indicator on the LCD shows low power, replace the CR2032 battery as described in the Setup section.
3. Storage
Store the device in a cool, dry place away from direct sunlight and extreme temperatures when not in use for extended periods.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not turning on. | Low or dead battery; incorrect battery installation. | Replace the CR2032 battery; ensure correct polarity. |
| No data recorded. | Logging not started; device stopped prematurely. | Ensure you press and hold the 'Start' button until the indicator flashes; avoid accidental 'Stop' button presses. |
| Cannot access data via USB. | Improper USB connection; computer driver issue. | Ensure the device is fully inserted into the USB port; try a different USB port or computer. |
| Inaccurate readings. | Device not calibrated; environmental interference. | Refer to software for calibration options if available; ensure device is placed in a stable environment away from direct heat/cold sources or strong air currents. Note that accuracy may vary at extreme temperatures. |
Specifications

Figure 5: Visual representation of the TempU03's physical dimensions and key performance specifications, including measurement ranges, accuracy, and data storage capacity.
- Model Number: TempU03
- Product Dimensions: 9 x 3.7 x 1.6 cm
- Item Weight: 40 g
- Measurement Range (Temperature): -40°C to 70°C (-40°F to 158°F)
- Measurement Range (Humidity): 0% to 100% RH
- Accuracy (Temperature): ±0.5°C (-20°C to +40°C), ±1.0°C (other range)
- Accuracy (Humidity): ±5% RH
- Data Storage Capacity: 32000 records
- Battery: 1 x CR2032 (included)
- Connectivity: USB
- Color: Blue
Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact Tzone customer service through their official website. Keep your purchase receipt as proof of purchase for warranty claims.

Figure 6: Image of the Certificate of Compliance for the Tzone TempU03, indicating adherence to various standards and regulations.
Applications
The Tzone TempU03 is suitable for a wide range of applications requiring temperature and humidity monitoring:

Figure 7: Collage showing various applications for the TempU03 data logger, including laboratory testing, cold chain transportation, medical refrigeration, food storage, greenhouse monitoring, and medical research.
- Lab Testing
- Cold Chain Transportation
- Medical Refrigerators
- Food Storage
- Greenhouses
- Medical Research
- Environmental Monitoring in homes or offices

Figure 8: The TempU03 data logger shown hanging inside a refrigerator, demonstrating its use in cold environments and highlighting its clear LCD display for both temperature and humidity readings.





