A humidity datalogger is used to record humidity levels during the storage and transport of goods that are sensitive to moisture. In 2026, these devices are commonly used across industries like food, pharmaceuticals, floriculture, and chemicals, where excess moisture or dryness can damage products before they reach their destination. Below, we answer the most common questions about how humidity monitoring works and when you need it.
What types of shipments actually need humidity monitoring?
Shipments that need humidity monitoring are those carrying goods that degrade, spoil, or lose value when exposed to the wrong moisture levels. This includes fresh produce, cut flowers, pharmaceuticals, seeds, and certain chemical products. For these goods, temperature alone does not tell the full story of what happened during transit.
Here are the most common shipment types that benefit from a humidity sensor logger:
- Fresh produce and fruit: Too much moisture accelerates mold and rot; too little causes wilting and dehydration.
- Cut flowers: Flowers are highly sensitive to both temperature swings and humidity fluctuations, which affect vase life and appearance on arrival.
- Seeds and plant material: Excess humidity during transport can trigger premature germination or fungal growth.
- Pharmaceuticals and health products: Many medicines, biologics, and diagnostic materials require tightly controlled humidity conditions to maintain efficacy.
- Chemicals and paints: Water-based products like paint can be irreversibly damaged by condensation or moisture exposure during shipping.
If your product has a recommended storage humidity range listed on its packaging or safety data sheet, it almost certainly needs humidity monitoring during transport.
How does a humidity datalogger work?
A humidity datalogger works by using a built-in humidity sensor to measure the relative humidity of the surrounding air at regular intervals throughout a shipment. The device stores these readings internally, creating a time-stamped log that shows exactly when and where humidity levels changed during transit.
Most electronic humidity data loggers use a capacitive sensor, which detects changes in electrical charge caused by moisture in the air. The sensor converts this into a percentage reading of relative humidity, typically alongside a temperature reading, since the two are closely related.
Once the shipment arrives, the stored data is retrieved and reviewed. Depending on the type of logger used, this is done via a USB connection, Bluetooth, or by tapping the device with an NFC-enabled smartphone. The data is then displayed as a graph or report showing the full humidity history of the journey.
What’s the difference between a humidity datalogger and a temperature datalogger?
The key difference is what they measure. A temperature datalogger records only temperature, while a humidity datalogger records relative humidity, and most modern models record both simultaneously. For many shipments, a combined temperature and humidity logger gives a more complete picture of the conditions a product experienced during transport.
Temperature and humidity are closely connected. When temperature drops, relative humidity tends to rise, and vice versa. This means that a shipment that stayed within the correct temperature range could still have experienced damaging moisture levels that a temperature-only logger would never detect.
For products where moisture is a known risk, such as flowers, seeds, or hygroscopic pharmaceuticals, using a combined temperature and humidity logger is the more complete approach. For goods where only temperature matters, such as frozen products or certain chemicals, a temperature-only logger may be sufficient.
When should you use a disposable versus a reusable humidity datalogger?
Use a disposable humidity datalogger for single-use shipments where retrieving the device from the recipient is impractical or too costly. Use a reusable logger when you control both ends of the supply chain, the device will reliably return to you, and shipment volume justifies the higher upfront cost.
In practice, the choice comes down to your supply chain structure:
- Disposable loggers are ideal for international shipments, multi-party supply chains, or high-volume operations where tracking device returns adds operational burden. They eliminate the risk of losing expensive hardware.
- Reusable electronic loggers suit closed-loop operations, such as internal distribution between your own warehouses or regular routes with trusted partners who will return the device.
There is also a third category worth knowing about. Tapp’s paper-based data loggers are a disposable option built on a fundamentally different model: made from agricultural waste paper with a lithium-free battery, they can be recycled through standard paper waste streams globally, unlike electronic loggers that require e-waste disposal. The lithium-free design also means there are no restrictions on air freight, which is a practical advantage that single-use plastic loggers with lithium batteries do not always offer. For organizations monitoring humidity across diverse international routes, this removes a logistical friction point that is easy to overlook until it causes a delay.
How Tapp helps with humidity datalogger monitoring
Tapp’s paper-based data loggers are designed for quality managers who need reliable cold chain monitoring without adding complexity to their operations. While the current logger focuses on temperature monitoring between -30°C and 50°C, the underlying platform is built to support the full range of cold chain visibility needs. Here is what makes the paper-based approach practical for shipments that demand close monitoring:
- No app needed: Any NFC-enabled smartphone can read the logger instantly, meaning receiving parties need no special hardware or software.
- Automatic cloud upload: Data uploads to the TappOS dashboard the moment the label is tapped, giving both sender and receiver access to the full shipment report.
- Lithium-free battery: Safe for air freight without special handling, and recyclable alongside the paper label through standard paper waste streams.
- Sustainable by design: Made from agricultural waste paper, the logger reduces e-waste by up to 90% compared to traditional plastic options.
If you are looking for a simpler, more sustainable way to monitor your temperature-sensitive shipments, contact the Tapp team to find out how paper-based logging can fit into your supply chain.
