M502-TH USB Reusable Temperature and Humidity Data Logger
LCD screen, configurable parameters, encrypted PDF report
The M502-TH records the temperature and humidity of food, medicine and chemicals during storage and transportation. Unlike a single use logger, it is configured through a USB connection, deployed as many times as you need, and read on its own LCD screen without connecting to anything.
It is built for closed loop routes and repeat lanes: refrigerated containers, reefer trucks, chain store distribution, laboratories and pharmaceutical storage, where the device comes back to you and the cost per shipment falls with every reuse.
- Temp range
- -30 to 70°C
- Accuracy
- ±0.3°C
- Capacity
- 14400 readings
- Battery life
- 3 to 4.5 months
What the M502-TH is built to do
A reusable logger changes the economics of temperature monitoring. A single use device is armed once and discarded, which suits one way export freight. But if your cargo travels a route you control, from your own cold room to your own branch, your own distribution centre or your own laboratory, discarding a device every trip is money leaving the building for no reason.
The M502-TH is designed for exactly that situation. It has a replaceable CR2450 cell, a two year shelf life, and a battery that runs 3 to 4.5 months of continuous logging. It is configured over USB, so alarm limits and logging intervals can be changed between deployments rather than being locked in at the factory.
What the LCD screen changes in practice
The most useful difference is not on the datasheet. A single use logger tells you nothing until the journey is over and someone plugs it in. The M502-TH shows the current reading, the statistical value, the alarm status and the battery level directly on its screen.
That means a receiving clerk can look at the device on the loading dock and know within two seconds whether the load breached its limits, before the pallet is signed for and moved into storage. Rejecting a load at the door is a very different conversation from discovering a problem three days later.
Why accuracy matters here
The M502-TH measures to ±0.3°C between -10 and 70°C, tightening on the single use range of ±0.5°C. For pharmaceutical cargo held in a 2 to 8°C window, that difference is meaningful: a wider tolerance eats into an already narrow band and produces borderline readings that are hard to defend in an audit.
Where it is used
The M502-TH is applied across warehouse management, logistics transportation and cold chain distribution, including cold chain transport, chain store networks, biological medicine, chemical reagents and drug stores. The measuring range of -30 to 70°C and 0 to 100%RH covers frozen, chilled and controlled ambient conditions in one device.
Three steps per deployment
Configure once, then repeat the same three steps on every shipment for the life of the device.
Configure the parameters
Connect the logger to a computer over USB and set the logging interval, alarm limits, start delay and time zone. Settings are retained until you change them.
Put the logger with your goods
Place it inside the carton, pallet or container with the cargo. The LCD stays visible so anyone handling the load can check status without tools.
Generate the PDF report
At the final site, plug the USB port directly into any computer and the encrypted PDF report is generated. Then reset and redeploy on the next shipment.
M502-TH full specifications
Complete measurement, recording and battery specification for the M502-TH reusable temperature and humidity data logger.
M502-TH technical data
| Use type | Reusable |
|---|---|
| Sensor | Digital temperature and humidity sensor |
| Temperature range | -30°C to 70°C |
| Humidity range | 0%RH to 100%RH |
| Temperature accuracy | ±0.3°C (-10°C to 70°C), ±0.5°C on other ranges |
| Humidity accuracy | ±5%RH (20 to 80%RH), ±8%RH on other ranges |
| Logging capacity | 14400 readings |
| Display | LCD, 8 status fields |
| Report | Encrypted PDF, generated automatically |
| Data export | USB 2.0 |
| Configuration | Via USB, user configurable between deployments |
| Battery | CR2450 |
| Battery life | 3 to 4.5 months |
| Shelf life | 2 years |
| Minimum order quantity | 5 pieces |
Logging interval, alarm thresholds, start delay and time zone are all set by you over USB, so the same device can serve different lanes with different requirements.
Set it your way, read it anywhere
Parameters are configured through the USB connection, and the PDF report is generated without any software at the receiving end.
Parameter configuration
Connect over USB to set the logging interval, high and low alarm thresholds, alarm delay, start delay and PDF report time zone. Nothing is locked at the factory, so one device can be reconfigured for a different lane whenever you need.
Auto PDF report
Plug the logger into any computer and an encrypted PDF is written directly to the device. The report holds the full temperature and humidity curve, the configured limits, every alarm event and the summary statistics, in a file that cannot be edited after generation.
What the LCD screen shows
- Alarm status
- Battery indicator
- Data unit, °C, °F or %RH
- Current logger system time
- PDF report time zone
- Running status, data logging
- Statistical value
- Measured value
Reading the device without a computer
All eight fields are visible on the screen at once, so the state of the shipment can be confirmed by anyone handling it. No app, no pairing and no cable are needed just to see whether the cargo stayed in range.
The alarm status field is the one that matters most on a loading dock. It tells the receiving clerk immediately whether a limit was breached during transit, which is the decision point for accepting or rejecting the load. Everything else, the full curve and the audit trail, comes later from the PDF.
The battery indicator is equally practical for a reusable device. Before sending the logger out again, one glance confirms whether the CR2450 has enough charge for the next 3 to 4.5 months of logging, rather than discovering a flat cell mid shipment.
What sets the M502-TH apart
Temperature and humidity in one
Both parameters are logged by a single digital sensor and both appear in the same PDF, suited to fresh food, medicine and reagents.
Reusable without reconfiguration
Settings are retained between deployments, so the device can go straight back out without repeating the setup for every shipment.
Automatic report generation
An encrypted PDF report is generated the moment the logger is plugged in. Nothing is installed at the receiving site.
Ultra low power design
Minimal current draw gives 3 to 4.5 months of continuous logging on one CR2450 cell, and a two year shelf life before deployment.
LCD status at a glance
Eight fields on screen, including alarm status, battery level and the current measured value, readable without any connection.
USB 2.0 data export
A built in USB 2.0 connector handles both configuration and report export, so no cradle, reader or proprietary cable is required.
±0.3°C measurement accuracy
Tighter than a typical single use logger across -10 to 70°C, which matters inside a narrow 2 to 8°C pharmaceutical window.
Full humidity range
0 to 100%RH coverage with ±5%RH accuracy in the 20 to 80%RH band, where most moisture sensitive cargo actually sits.
Where the M502-TH is deployed
Widely used for temperature and humidity recording in warehouse management, logistics transportation and cold chain distribution.
Cold chain transportation
Reefer containers and refrigerated trucks on repeat lanes, where the logger returns with the vehicle or the empty container.
Blood and plasma transport
Whole blood, plasma and platelets moving between collection centre, laboratory and hospital, where the device cycles back each time.
Biological medicine
Vaccines and biologics held in a 2 to 8 degree window, where the tighter 0.3 degree accuracy and an auditable PDF are required.
Vaccine distribution
Immunisation programmes running fixed routes between the central store and clinics, where the same loggers are reused every cycle.
Food and chemical reagent
Fresh produce, chilled food and reagent stock where both temperature and humidity affect shelf life and assay results.
Drug store and chain retail
Pharmacy refrigerators and chain store distribution, where a permanent monitoring record is part of licensing and audit.
Is the M502-TH the right model for your lane?
The M502-TH pays for itself through reuse. If the device will not come back, a single use logger is the cheaper answer.
| Specification | M502-TH | M501 | M371 / M381 |
|---|---|---|---|
| Type | Reusable | Single use | Real time, single use |
| Display | LCD, 8 fields | LED only | LED only |
| Temperature accuracy | ±0.3°C | ±0.5°C | ±0.3°C |
| Configuration | By user over USB | Preset at factory | Preset at factory |
| Reporting | PDF at destination | PDF at destination | Live to cloud platform |
| Battery | CR2450, 3 to 4.5 months | CR2450, 90 day cycle | 2000 or 4000 mAh |
| Shelf life | 2 years | 1 year | Varies by model |
| Best suited to | Closed loop routes | One way export freight | High value lanes |
| Minimum order | 5 pcs | 5 pcs | 5 pcs |
| Product page | You are here | View M501 | View M381 4G |
Many buyers run a mixed fleet: the M502-TH on lanes they control, and the M501 on outbound export where the device will not return. Both can be quoted in one order.
M502-TH questions from buyers
How many times can the M502-TH be reused?
There is no fixed cycle limit. The practical constraint is the CR2450 battery, which supports 3 to 4.5 months of continuous logging. Across short shipments that adds up to a large number of deployments, and once the cell is depleted it is replaced rather than the whole device.
Settings are retained between deployments, so a device that comes back can go straight out again without repeating the configuration.
What is the difference between the M502-TH and the M501?
The M501 is single use: armed once, discarded after the report is generated, and preset at the factory. The M502-TH is reusable, configured by you over USB, and carries an LCD screen showing the alarm status, battery level and current reading without any connection.
The M502-TH is also more accurate, at ±0.3°C against ±0.5°C. Choose the M501 for one way export freight and the M502-TH for routes where the device returns to you.
Do I need software to configure the logger?
Configuration is done through the USB connection, where you set the logging interval, high and low alarm limits, alarm delay, start delay and the PDF report time zone. Reading the report needs nothing at all: the encrypted PDF is written straight to the device and opens in any PDF viewer.
Can the battery be replaced?
Yes. The M502-TH uses a standard CR2450 lithium coin cell that can be replaced when depleted, which is what makes long term reuse practical. Shelf life before first deployment is 2 years.
How accurate is the M502-TH?
Temperature accuracy is ±0.3°C between -10°C and 70°C, and ±0.5°C on the remaining range down to -30°C. Humidity accuracy is ±5%RH between 20 and 80%RH, and ±8%RH outside that band. The full measuring range is -30 to 70°C and 0 to 100%RH.
Can I set my own alarm limits for different lanes?
Yes, and this is one of the main reasons buyers choose a reusable model. Because configuration is done over USB rather than fixed at the factory, the same device can run a 2 to 8°C pharmaceutical profile this week and a frozen profile the next, without ordering a different unit.
How many readings can it store?
The logging capacity is 14400 readings. How long that covers depends on the interval you configure: a longer interval stretches the recording window, a shorter one gives higher resolution over a shorter trip. Tell us your typical transit time and we will suggest an interval.
What is the minimum order quantity for the M502-TH?
The minimum order quantity is 5 pieces, the same across our whole data logger range. That low threshold is deliberate: it lets you run a real trial on one lane, configure the device yourself, read the PDF report your own team receives, and confirm the M502-TH suits your process before committing to volume.
OEM and ODM orders that require custom housing, private label printing or firmware changes carry a higher minimum, since tooling and setup are involved. Contact our sales team with your quantity and destination and we will confirm pricing and lead time.
Other HLY data loggers
M501
USB PDF Single Use Temperature and Humidity Data Logger
Armed with one button, 90 day recording cycle, IP67 housing and an encrypted PDF report at the destination. Built for one way export freight.
M371
3G Real Time Temperature and Humidity Data Logger
Pull the strip and it starts uploading to the H7 cloud platform, with SMS and email alarms while the cargo is still in transit.
M381
4G Real Time Temperature and Humidity Data Logger
Full band 4G for cross border lanes, with blind area retransmission so no reading is lost in low coverage zones.
Get M502-TH pricing for your lane
Send us your route, required temperature and humidity range, deployment frequency and monthly volume. We will confirm the recommended logging interval, alarm preset, unit price and lead time. The minimum order is only 5 pieces, so a trial run on a single lane costs very little before you commit to volume.
- Manufacturer
- HLY TECHNOLOGY CO., LIMITED
- Office
- Baoan District, Shenzhen, Guangdong, China
- Phone
- +86 1331 8318 365
- sales@hly-logger.com