Gaps overnight & on weekends
A freezer can drift for hours between manual checks. By the time someone writes it down, product is already lost.
Cold-chain & refrigeration
Every cooler and freezer, watched around the clock.
Continuous wireless temperature and humidity monitoring for restaurants, hotels, schools, hospitals, grocery and cold storage - with HACCP-ready records an inspector can trust.
ac_unit −80 °C to +25 °C target ±0.3 °C description HACCP-ready verified ISO/IEC 17025
Walk-in Freezer−18.2 °C · live
The problem with clipboards
Manual logs fail you exactly when it counts.
Records that don't hold up
Hand-written sheets get back-filled, smudged, or lost - and won't survive a serious audit or a recall investigation.
Shrink you can't explain
Without continuous data you can't prove what spoiled, when, or why - so the loss just becomes someone's bad week.
How it works
Mounted in minutes. Logging forever.
1
Mount the sensor
Stick or screw a battery-powered sensor inside each cooler, freezer or display case. No wiring, no drilling into the box.
2
Pair to a gateway
One LoRaWAN gateway covers a whole building - even through thick freezer walls - and connects to the cloud.
3
Set your limits
Define safe ranges per unit. Pick who gets an SMS, email or call - with no caps on rules or recipients.
4
Prove it
Every reading is logged automatically. Export a clean, time-stamped PDF the moment an inspector asks.
Audit-ready by default
HACCP records that defend themselves.
Continuous, tamper-evident logs with NIST-traceable accuracy - and dual-sensor verification so a drifting probe can never quietly corrupt your history.
- check Automatic, time-stamped readings - nothing to back-fill
- check One-click PDF and CSV exports for any date range
- check Per-serial ISO/IEC 17025 certificates for every sensor
- check Corrective-action notes logged against each excursion
Why the sensor wins
The strongest sensor in the cold aisle.
Anyone can stick a thermometer in a freezer. CropWatch is engineered so the number you log is one you can defend - and so a failing sensor never quietly becomes a failed audit.
ISO/IEC 17025 certified - individually
Every sensor is calibrated in an accredited process and ships with its own NIST-traceable certificate tied to its exact serial number. Not a batch sheet - proof for the specific device on your wall, downloadable the moment an inspector asks.
Dual-sensor design - error, never a lie
Two independent elements cross-check every reading. If they disagree, the device refuses to publish and raises an error code instead. You will never log an inaccurate number - "no data" beats "wrong data" every single time.
Field-replaceable - no calibration downtime
On-site calibration eats hours and, without lab-grade reference equipment, introduces error. CropWatch skips it entirely: snap in a pre-calibrated module in under a minute. No truck roll, no guesswork, no gap in your records.
User-replaceable battery
When the cell finally runs down after years of service, you swap it yourself - no returning the unit, no proprietary service call. The sensor stays exactly where it is and keeps right on logging.
LoRa - built for deep-freeze penetration
Wi-Fi and Bluetooth die at the freezer wall. Our LoRa-based signal pushes through thick insulated panels and below-grade walk-ins, so a single gateway blankets the whole building - even the boxes others can't reach.
Proven stability & real support
An unmatched track record for long-term sensor stability, backed by people who actually pick up when you need them. The hardware self-audits and flags drift before it misleads you - and we're there when it counts.
Recommended sensor
CW-AIR-TH - air temperature & humidity
- Measures
- Temp · RH · dew point
- Range
- −40 °C to +85 °C
- Accuracy
- ±0.3 °C / ±2 %RH
- Verification
- Dual-sensor cross-check
- Connectivity
- LoRaWAN (Class A)
- Battery
- Up to 10 years
- Enclosure
- IP66, food-safe
- Calibration
- NIST · ISO/IEC 17025
Questions
Cold-chain monitoring FAQ
Does it work inside a metal walk-in freezer? add
Yes. LoRaWAN punches through thick freezer walls far better than Wi-Fi or Bluetooth, and a single gateway typically covers an entire building. For very large or below-grade sites we add a second gateway.
Will the records satisfy a health inspector or HACCP audit? add
That's what they're built for. Readings are logged automatically with NIST-traceable accuracy, dual-sensor verification, and per-serial ISO/IEC 17025 certificates. You can export a clean, time-stamped report for any range in one click.
What happens if a sensor fails or drifts? add
The dual-sensor design catches a drifting element and withholds the reading rather than logging a wrong one. The hardware also self-audits and raises a fault. When a module reaches end of life, you swap it yourself in under a minute.
Are there per-user or per-report fees? add
No. Unlimited users, alert rules, recipients, reports and full API access are included with the sensors - no tiers, no seat licenses, no metered exports.
Ready when you are
Put a sensor in your coldest box this week.
Tell us how many coolers and freezers you run. We'll size the sensors and gateway and show you the audit trail it produces.