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Our goal is simple: help you understand how temperature data logger calibration works and how to build calibration into your cold chain process.
Temperature logger calibration refers to the process of verifying the output of a temperature logger against a temperature instrument of known and traceable performance. Essentially, is the logger measuring within its accuracy specifications?
That is why Temperature Logger Calibration matters. Calibration compares your logger’s readings with a suitable reference to check its measurement performance. It is not the same as simply checking whether the device is recording data.
WHO lists temperature data loggers and temperature recorders among the devices used to monitor temperatures throughout the cold chain and provides performance and verification requirements for these devices.
In this guide, we’ll explain the practical steps you can take to keep your Best temperature data logger calibration accurate, documented, and useful for your cold chain operations.
Temperature Logger Calibration is the process of comparing a temperature logger’s readings with a reference instrument whose measurement performance is known and traceable.
The purpose is to find out whether your logger is measuring temperature within its required accuracy.
WHO classifies data loggers and temperature recorders among the devices used to monitor temperatures throughout the cold chain. Its current guidance also includes performance specifications and verification protocols for temperature monitoring devices.
In simple terms:
Logger reading → Reference reading → Difference identified → Result documented.
This is different from simply checking whether a logger turns on and records data.
When storage or transport conditions change out of their required range, temperature-sensitive pharmaceuticals, food, biologics, and other products may be affected.
A reliable logger gives your team better evidence when reviewing a shipment. An inaccurate device can create uncertainty about what actually happened.
Here is a practical example. Suppose your logger reports 5°C throughout a refrigerated shipment. Later, calibration shows that the device has developed a measurement error. Your team may then need to assess whether previous records were reliable.
That is why calibration should be part of your wider monitoring program, not an isolated paperwork task.
Start with accuracy, operational range, and the manufacturer’s recommendation for calibration intervals.
The reference instrument should have appropriate traceability and documentation. Tempnote’s calibration service says that it performs calibrations to traceable standards and national metrology institutes via a partnership with NABL-accredited labs.
Record the:
| Calibration Record | Why It Matters |
|---|---|
| Logger ID | Identifies the exact device |
| Calibration date | Shows current status |
| Calibration points | Shows the tested range |
| Results | Shows measurement performance |
| Certificate | Provides supporting evidence |
A calibration certificate should be linked to the specific device so your team can retrieve it during an internal review or audit.
These terms are related, but they are not identical.
Calibration compares the device with a reference to establish measurement performance.
Sensor verification is a check that the device continues to perform within your defined acceptance limits.
You can use verification as part of routine quality checks, while formal calibration provides documented measurement evidence.
WHO also publishes verification protocols for cold chain temperature monitoring devices, showing why device performance checks are an important part of temperature monitoring programs.
Do not simply put the device back into service.
First, review the result against your acceptance criteria. After that, you need to review the calibration records and consider if the previous temperature data has been potentially affected.
Depending on the result, you may need to:
The right response depends on the size of the error, the product requirements, and your quality procedures.
Create a simple calibration register for every reusable logger. Track its identification number, calibration date, next due date, certificate, and status.
For critical cold chain operations, calibration history of devices should be considered when such devices are selected for transportation.
WHO’s current guidelines provide a basis for temperature mapping and monitoring of temperature when appropriate for pharmaceutical storage and transport. Its 2026 temperature-mapping tool supports the use of specific temperature data loggers for mapping cold chain equipment and storage areas.
For example, a multi-use Tempnote logger provides temperature and humidity monitoring, a stated ±0.5°C temperature accuracy across its specified range, EN12830 certification, and a validation certificate.
Your temperature records are only as useful as the device producing them. A good calibration process helps you maintain temperature measurement accuracy, support traceability, and make better decisions when reviewing cold chain performance.
If your team requires calibration of data loggers, Tempnote provides calibration services for data loggers measuring temperature and other parameters, with calibration certificates and traceability to national standards.
This is determined by the risk assessment, company policy, the device’s history, as well as the manufacturer’s recommendations.
A data logger is measured against a reference to determine the acceptability of the measurement.
This document gives assurance that the work done on the logger, the measurements, the standards of reference, and the other data have been recorded, and provides traceability of the calibration to recognized standards.
Calibration assures measurement performance, while verification assures measurement is within acceptable limits.
Do not automatically return it to service. Assess the result, review potentially affected records, and follow your corrective-action procedure.
