An electronic temperature data logger for continuous, real-time, and whole-process traceable monitoring of vaccine and biological product storage and distribution. Approved by the WHO (PQS code: E006/042) and sourced directly through WHO procurement programs, the HETL-01 is the global reference solution for ensuring cold chain integrity in immunization programs.

Specifically designed for 2°C to 8°C vaccine storage environments, the device records temperature data every 6 minutes for over 30 consecutive days. When memory capacity is reached, the oldest data is automatically overwritten by new records, ensuring uninterrupted traceability throughout operation. A resolution of 0.1°C delivers high-precision readings at every data point.

An integrated visual high/low temperature alarm alerts the operator immediately upon any deviation from the safe range — fully meeting WHO standards. The built-in LCD screen displays the current temperature at a glance, with no need for auxiliary equipment. The temperature sensor is integrated directly into the device body, rated IP65 for dust and water resistance, enabling safe placement inside vaccine refrigerators, cold boxes, and cold rooms.

Data transfer is performed via direct USB connection to any PC, which automatically generates a CSV file with complete temperature records and a historical graph — compatible with data management software for in-depth analysis and regulatory documentation. The wide-temperature-range lithium battery is built-in and non-replaceable, with a minimum operating life of 2 years after activation and a maximum shelf life of 1 year. A mounting bracket is included as a standard accessory.

Technical Specifications

Key Features

• WHO PQS approval (code E006/042) and direct use in WHO procurement programs

• Designed specifically for 2–8°C vaccine storage with integrated visual high/low temperature alarm

• Continuous logging at 6-minute intervals, capacity over 30 days with automatic overwrite

• 0.1°C resolution for high-precision temperature readings

• Integrated LCD display for immediate temperature visualization

• USB connection for automatic CSV file and historical graph generation on any PC

• Compatible with data management software for regulatory documentation

• IP65 dust and water resistant — suitable for installation inside refrigerators, cold boxes, and cold rooms

• Built-in lithium battery with ≥ 2-year operating life after activation

• Mounting bracket included as standard

Applications

The HETL-01 is designed for health posts, clinics, hospitals, immunization centers, pharmacies, clinical laboratories, and national vaccination programs that require continuous, traceable temperature monitoring of vaccine and immunobiological storage. It is the standard choice for organizations that must demonstrate regulatory compliance with WHO criteria and national health authority requirements.

The device is equally applicable for monitoring freezers and storage chambers for reagents, blood products, and temperature-sensitive biological materials that require historical records and automatic report generation for audits and health inspections.