1. Introduction
The Frigga U2 USB Temp Logger and M2H Reusable Temp Logger are advanced data loggers designed for precise monitoring and recording of temperature and, for the M2H model, humidity. These devices are suitable for various applications including cold chain logistics, storage, and laboratory experiments, ensuring data integrity for critical environments.
Key features include:
- Multi-Use Functionality: The M2H model is reusable, while the U2 is a single-use device.
- Auto-Generated Reports: Direct PDF and CSV report generation upon connection to a computer, requiring no special software.
- LED Alarm Indicator: Visual alerts for temperature excursions beyond predefined thresholds.
- Wide Application Range: Ideal for food, pharmaceutical, and laboratory use.
- Companion Software: Frigga Data Software (for M2H) for advanced configuration and data analysis.
2. Setup
2.1 Frigga M2H Reusable Temp Logger
Before initial use, the M2H logger requires configuration using the Frigga Data Software. This software is compatible with Windows and Mac OS and can be downloaded from the official Frigga website. The software allows you to set critical logging parameters.
- Delayed Start: Configure a specific time or delay before logging begins.
- Logging Intervals: Define how frequently data points are recorded.
- Temperature Units: Select between Celsius (°C) or Fahrenheit (°F).
- Time Zones: Adjust for local time.
- Temperature and Humidity Alarm Ranges: Set upper and lower thresholds for alerts.
Connect the M2H logger to your computer via the USB port to access the Frigga Data Software for parameter setup.

This image shows the Frigga M2H data logger connected to a computer displaying the Frigga Data Center software interface. The software allows users to configure logging parameters such as temperature units, alarm ranges, logging intervals, and start/stop conditions. This setup process is essential before deploying the logger for data collection.
2.2 Frigga U2 USB Temp Logger
The Frigga U2 is a single-use data logger, typically pre-configured for immediate deployment. No software setup is generally required before starting a logging session.
3. Operating Instructions
3.1 Starting a Logging Session
- For M2H: Press and hold the 'START' button until the 'REC' indicator lights up, confirming that logging has begun.
- For U2: Press and hold the 'START' button until the 'OK' indicator lights up, confirming that logging has begun.
If a delayed start was configured (for M2H), the device will begin logging automatically after the set delay.
3.2 Stopping a Logging Session
- For M2H: Press and hold the 'STOP' button until the 'REC' indicator turns off.
- For U2: Press and hold the 'STOP' button until the 'OK' indicator turns off.
Logging will also stop automatically once the memory is full or the configured logging duration ends.
3.3 Retrieving Data Reports
After a logging session is complete, connect the data logger to any computer's USB port. The device will automatically generate a PDF report and a CSV data file. These files can be accessed directly from the device as a removable drive, without the need for additional software installation.

This image illustrates the Frigga M2H data logger connected to a laptop, demonstrating its ability to auto-generate PDF and CSV reports without requiring additional software. The screen shows icons for PDF and CSV files, indicating the direct report generation feature.

This image illustrates the Frigga U2 data logger connected to a laptop, demonstrating its ability to auto-generate PDF and CSV reports without requiring additional software. The screen shows icons for PDF and CSV files, indicating the direct report generation feature.
3.4 LED Alarm Indicator
The device features an LED alarm indicator that illuminates if recorded temperature or humidity values (for M2H) exceed the pre-set high or low thresholds. Refer to the device's display or generated report for specific alarm details.
4. Maintenance
4.1 Battery Replacement (M2H Reusable Logger Only)
The Frigga M2H reusable logger uses a replaceable coin cell battery. When the battery level is low, replace it to ensure continuous operation and data integrity.
- Locate the battery compartment on the back of the device.
- Use a coin or small tool to twist the battery cover counter-clockwise to open.
- Remove the old battery and insert a new CR2450 coin cell battery, ensuring correct polarity.
- Replace the cover and twist clockwise to secure.

This series of four images demonstrates the step-by-step process for replacing the battery in the Frigga M2H reusable data logger. Image 1 shows the back of the device. Image 2 shows how to open the battery compartment cover. Image 3 shows inserting a new coin cell battery. Image 4 shows the battery compartment with the new battery in place.
4.2 Cleaning
Wipe the exterior of the device with a soft, damp cloth. Do not use abrasive cleaners or immerse the device in water unless specified for its IP rating.
5. Troubleshooting
- Device Not Starting: Ensure the battery is correctly installed and charged (for M2H). Press and hold the start button firmly for the required duration.
- No Report Generated: Verify the device is properly connected to a USB port. Ensure the logging session was stopped correctly. Try connecting to a different USB port or computer.
- Inaccurate Readings: Ensure the device is placed in an environment suitable for its operating range. Avoid placing it near heat sources, direct sunlight, or areas with extreme air currents.
- LED Alarm Constantly On: Check the generated report to identify if temperature or humidity values have consistently exceeded the set thresholds. Adjust thresholds via Frigga Data Software if necessary (for M2H).
6. Specifications
6.1 Frigga M2H Reusable Temp Logger
| Measurement Range (Temperature) | -30°C ~ +70°C (-22°F ~ +158°F) |
| Measurement Range (Humidity) | 5% ~ 95% RH |
| Accuracy Range (Temperature) | ±0.5℃ (-20℃~ +40℃); ±1℃ for other range |
| Accuracy Range (Humidity) | ±3% (20%~80% RH); ±5% for other range |
| Data Memory | 14400 readings |
| Waterproof Grade | IP65 |
| Dimensions | Approx. 4.41 inches (H) x 1.85 inches (W) |

This image displays the Frigga M2H data logger with its dimensions and key product parameters. It highlights a height of 4.41 inches and a width of 1.85 inches, along with measurement ranges for temperature (-30°C to 70°C) and humidity (5% to 95% RH), and accuracy ranges.

This image shows the Frigga M2H data logger with a splash of water, illustrating its IP65 waterproof rating. This indicates the device is protected against dust ingress and low-pressure water jets from any direction.
6.2 Frigga U2 USB Temp Logger
| Measurement Range (Temperature) | -30°C ~ +70°C (-22°F ~ +158°F) |
| Accuracy Range (Temperature) | ±0.5℃ (-20℃~ +40℃); ±1℃ for other range |
| Data Memory | Max 14400 readings |
| Dimensions | Approx. 2.72 inches (H) x 1.14 inches (W) |

This image displays the Frigga U2 data logger with its dimensions and key product parameters. It highlights a height of 2.72 inches and a width of 1.14 inches, along with measurement ranges for temperature (-30°C to 70°C) and accuracy ranges, and memory capacity.

This image shows the Frigga U2 Single-Use Data Logger, highlighting its USB 2.0 interface, the press button for operation, and the LED indicator for status alerts.
7. Warranty and Support
For detailed warranty information, technical support, and frequently asked questions, please visit the official Frigga website or contact Frigga customer service directly. You can also find more information at the Frigga Store on Amazon.





