M371 3G Real Time Disposable Temperature and Humidity Data Logger
Pull the strip and it reports live, no parameter setting required
The M371 is a high precision single use recorder built on a 3G wireless network. Instead of holding data until the journey ends, it uploads temperature, humidity and position to the H7 cloud platform while the cargo is still moving, so an excursion triggers an SMS or email alert to your team the moment it happens.
The design is solid, reliable and compact, with global 3G network communication that gives wide coverage, strong anti interference performance and straightforward networking. The SIM card is installed at the factory: pull out the strip and the device is live.
- Network
- 2G or 3G
- Accuracy
- ±0.3°C
- Memory
- 7200 readings
- Runtime
- Up to 100 days
What the M371 is built to do
A USB logger answers one question well: did the cargo stay in range? It answers it after the fact, once someone plugs the device in at the destination. For most freight that is enough, because by then the only decision left is whether to accept the load.
Some lanes do not work that way. If a reefer unit fails on day two of a fourteen day sea leg, knowing about it on day fourteen changes nothing. Knowing about it on day two means a call to the shipping line, an intervention at the next port, and cargo that arrives sellable instead of written off. That is the gap the M371 fills.
Live data, not a post mortem
The M371 uploads to the H7 cloud platform on a schedule you choose, typically every 60 or 120 minutes. From one interface your team can view live temperature and humidity, see where the shipment is, read the alarm history, manage devices and export data. When a threshold is breached, the platform sends a short message to the responsible personnel rather than waiting for someone to check a dashboard.
Nothing to configure
The device is deliberately simple to deploy. The SIM card is installed before the unit leaves the factory, so activation is a single physical action: pull out the strip. There is no parameter setting, no pairing step and no app to install. Warehouse staff handling the shipment need no training beyond that one motion.
Coverage gaps do not break the record
Real time monitoring is only as good as the network underneath it, and cold chain routes pass through tunnels, port yards and rural stretches with poor reception. The M371 handles this with signal blind area data retransmission: readings taken while offline are held and sent once coverage returns, so the curve in your report has no holes in it.
Data is also written to local flash memory in parallel with the cloud upload. If something goes wrong with connectivity entirely, the USB port still produces a complete PDF report at the destination.
Where it is used
The M371 suits vaccine distribution, blood transport, pharmaceutical shipments, fresh produce and containerised freight. It is the model to choose when the value of the cargo, or the cost of a failed delivery, is high enough that finding out during transit is worth more than finding out on arrival.
One movement to activate
The device is ready straight out of the box. Pull out the strip to activate the built in SIM card. No parameter setting is required.
M371 full specifications
Complete communication, measurement and power specification for the M371 3G real time single use data logger.
Communication and measurement
| Type | Single use |
|---|---|
| Communications | 2G or 3G |
| Location | LBS |
| Sensor 1 | Temperature and humidity, internal |
| Sensor 2 | Light, internal |
| Measurement range | -30°C to 70°C or -40°C to 70°C, 0%RH to 100%RH |
| Temperature accuracy | ±0.3°C (-10°C to 70°C), ±1°C on other ranges |
| Humidity accuracy | ±5%RH (20 to 80%RH), ±8%RH on other ranges |
| Memory | 7200 readings |
Platform, power and protection
| Cloud platform | H7 or customized |
|---|---|
| Warning | LED light, SMS or email via platform alarm |
| SIM card | Built in, installed before dispatch |
| Battery capacity | 2000 mAh or 4000 mAh |
| Waterproof class | IP65 |
| Shelf life | 1 year |
| Software upgrade | Remote platform upgrade |
| Local storage | Flash memory plus USB PDF export |
| Minimum order quantity | 5 pieces |
Positioning uses LBS, which derives location from the mobile network rather than a satellite fix. It gives a reliable indication of which city or route segment the shipment is on, which is what matters for cold chain intervention.
Recording up to 100 days
Runtime depends on two things you choose at order stage: the upload interval and the battery capacity. Four variants cover the range.
| Product model | Sensor type | Upload every 60 mins | Upload every 120 mins | Battery |
|---|---|---|---|---|
| M371-T | Temperature | 30 days | 50 days | 2000 mAh |
| M371-TH | Temperature and humidity | 30 days | 50 days | 2000 mAh |
| M371-T-XL | Temperature | 60 days | 100 days | 4000 mAh |
| M371-TH-XL | Temperature and humidity | 60 days | 100 days | 4000 mAh |
A longer upload interval doubles the runtime without reducing what is recorded locally. For a 40 day sea leg, the XL variant at 120 minute uploads is the usual choice.
One interface for the whole fleet
Live readings, position, alarm history, device management and data export, all from a browser. Custom platform integration is available on request.
Remote monitoring dashboard
View temperature and humidity as it is recorded, receive alarm notifications, track positioning information, manage devices and export data from a single interface.
Multiple status display
Each device reports its state clearly: normal, over temperature alarm, offline, temperature sensor failure and more, so a problem is visible without opening the record.
Records stored for 3 to 5 years
Real time data, over temperature alarm records, email and SMS alarm records and average records are retained on the platform, which matters when a claim or an audit arrives long after the shipment closed.
Automatic PDF report
Beyond the cloud upload, the M371 stores data locally in flash memory. Connect the USB port and a full PDF report is generated automatically, so critical information is available even if connectivity failed.
M371 detailed view
Solid, reliable and compact, rated IP65 against the working environments a cold chain device actually sees.
What sets the M371 apart
High performance digital sensor
A built in digital sensor gives ±0.3°C accuracy between -10 and 70°C, with stable performance across the full working range.
Ready out of the box
No parameter setting is needed. Pull the strip to activate the built in SIM and the device starts logging and uploading straight away.
Global 3G connectivity
A full band 2G and 3G communication module gives wide coverage, strong anti interference performance and simple networking.
Signal blind area retransmission
Readings taken with no coverage are held and sent once signal returns, so the data chain stays continuous through tunnels and port yards.
Real time and scheduled upload
Both instant and timed uploads are supported, so alarm data is transmitted promptly rather than waiting for the next scheduled window.
Optional low light detection
A second internal sensor can detect light, which flags an unexpected container or carton opening during transit.
IP65 waterproof design
Engineered to withstand the working environments a cold chain device actually meets, including condensation and washdown.
Local data export
Records can be exported to local storage through our upper computer software, or written to a PDF report through the USB port.
Where the M371 is deployed
Real time monitoring earns its cost on lanes where an excursion discovered in transit can still be acted on.
Vaccine distribution
Immunisation supply where a breach means a discarded batch, and an SMS alert in transit can still save it.
Blood transport
Whole blood, plasma and platelets moving between collection centre, laboratory and hospital on a tight clock.
Pharmaceutical
High value medicine held in a narrow window, where the platform alarm reaches the responsible person directly.
Fruit and vegetable
Fresh produce export where a few hours out of range shortens shelf life enough to change the arrival grade.
Containerised freight
Long sea legs where the XL variant covers up to 100 days and position data shows which leg the problem occurred on.
Refrigerated fleet
Road distribution where live position plus temperature lets dispatch redirect a vehicle before the load is lost.
M371 3G or M381 4G?
The two real time models are functionally close. The deciding factor is the network available on your lanes.
| Specification | M371 | M381 | M501 |
|---|---|---|---|
| Network | 2G or 3G | 3G or 4G full band | None, USB only |
| Reporting | Live to H7 cloud | Live to H7 cloud | PDF at destination |
| Positioning | LBS | LBS | None |
| Temperature accuracy | ±0.3°C | ±0.3°C | ±0.5°C |
| Memory | 7200 readings | 7200 readings | 14400 readings |
| Alarm notification | SMS and email in transit | SMS and email in transit | In the report |
| Protection class | IP65 | IP65 | IP67 |
| Best suited to | Lanes with 3G coverage | Cross border and 4G only lanes | One way export freight |
| Minimum order | 5 pcs | 5 pcs | 5 pcs |
| Product page | You are here | View M381 4G | View M501 |
Several countries have begun retiring 2G and 3G networks. If your lanes cross those markets, the M381 4G is the safer specification for the next several years.
M371 questions from buyers
Do I need to buy a SIM card or a data plan separately?
No. The SIM card is built in and installed before the device leaves the factory. Activation is a single physical action: pull out the strip. There is no account to set up, no APN to configure and no separate carrier contract to arrange.
What is the difference between the M371 and the M381?
The hardware, sensors, accuracy, memory and cloud platform are the same. The difference is the communication module: the M371 uses 2G or 3G, the M381 uses a full band 3G or 4G module intended for global use.
Choose the M371 where 3G coverage is solid on your lanes, and the M381 for cross border shipping or markets that have already retired their older networks.
How long can the M371 run on one shipment?
It depends on the upload interval and the battery. The standard 2000 mAh variants run around 30 days uploading hourly, or 50 days uploading every two hours. The XL variants with 4000 mAh reach roughly 60 and 100 days on the same intervals.
Tell us your transit time and we will confirm which variant and interval to specify.
What happens when the device passes through an area with no signal?
Readings continue to be taken and stored. When coverage returns, signal blind area data retransmission sends the backlog to the platform, so the record has no gaps. Data is also written to local flash memory in parallel, and can be exported as a PDF through the USB port regardless of what happened to connectivity.
How accurate is the positioning?
The M371 uses LBS positioning, which derives location from the mobile network rather than a satellite fix. It reliably identifies the city or route segment a shipment is on, which is the level of detail that matters when deciding where to intervene. It is not intended as a metre level GPS tracker.
How long is the data kept on the cloud platform?
Records are retained on the H7 platform for 3 to 5 years, covering real time data, over temperature alarm records, email and SMS alarm records and average records. That horizon matters because claims and audits often arrive long after a shipment has closed.
Can the alarm go to more than one person?
Yes. When a threshold is exceeded, the platform sends a short message to the relevant management personnel, and email alarms are supported alongside SMS. The device itself also shows an LED warning. Recipients are configured in the platform, not on the device, so they can be changed at any time.
What is the minimum order quantity for the M371?
The minimum order quantity is 5 pieces, the same across our whole data logger range. That low threshold lets you run a real trial on one lane, watch the data arrive on the platform yourself, and confirm coverage on your route before committing to volume.
OEM and ODM orders that require custom housing, private label printing or a customised cloud platform carry a higher minimum, since setup work is involved. Contact our sales team with your quantity and destination for pricing and lead time.
Other HLY data loggers
M381
4G Real Time Temperature and Humidity Data Logger
Same platform and sensors as the M371, with a full band 4G module for cross border lanes and markets that have retired 3G.
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.
M502-TH
USB Reusable Temperature and Humidity Data Logger
LCD display with live readings and alarm status, ±0.3°C accuracy, redeployable on closed loop routes.
Get M371 pricing for your lane
Send us your route, required temperature range, transit duration and monthly volume. We will confirm network coverage on your lanes, the right variant and upload interval, unit price and lead time. The minimum order is only 5 pieces, so a trial run 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