What this solves
When the workflow happens at the device, not the dashboard.
The S6K logs every reading, generates the PDF on the device itself, and prints a paper copy on a paired Bluetooth printer — no laptop, no portal, no signal needed. Operators can review the last 10 alarms on-screen, check max/min temps, and confirm device status from the keypad. When 4G is back, everything uploads to the cloud automatically.
4 buttons
full on-device menu — System info · Start record · Alarm log · Bluetooth print · Flight Mode · Restart. No app required for daily operation.
BT Print
pair an external Bluetooth printer for on-site paper records. Field-audit ready without a laptop. For SOPs that still require signed paper.
−200 / +150°C
external PT100 cryogenic probe option. NTC for standard ranges. Built-in for ambient. One device, every zone.
Why operators choose S6K
When the workflow happens at the device, not the dashboard.
2″ TFT color screen + 4-button menu
Live temp, humidity, battery, signal at a glance. Eight on-device menu functions — full operation without an app.
On-device PDF + Bluetooth print
Recording PDFs generate on the device. Export via USB or print on a paired Bluetooth printer — no laptop, no internet.
−200°C to +150°C — single device
External PT100 covers cryogenic to high temp. NTC handles standard ranges. Built-in sensor for ambient. One device, every zone.
Customizable sensor stack
Add oxygen, vibration, or light sensors for pharma rooms, sample shippers, blood transport, vehicle cabins. Tell us the environment.
Why ZKSCool
Why ZKSCool S6K — when the operator owns the record.
| OTHER SUPPLIERS | ZKS-S6K | ZKS-S6SA | |
| PT100 cryogenic (−200°C to +150°C) | ~ Separate cryogenic SKU · premium tier | ✓ Same SKU — pluggable probe option | ✓ Same SKU — pluggable probe option |
| Built-in event sensors | — Temperature only · door/light/vibration external add-on if at all | ~ GSP con~Customizable: oxygen, vibration, light | ✓ Built-in door magnetic + light + vibration — standard |
| On-device records | — Cloud-only · portal trip required | ✓ On-device PDF · USB export · Bluetooth printer pairing | ~ Cloud-based · multi-channel push |
| Multi-channel alarm routing | ~ Email + SMS via vendor dashboard | ✓ Sound + light · cloud · App · WeChat · SMS · voice | ✓ Sound + light · cloud · App · SMS · voice |
| Transport / aviation testing | ~ Regional shipping certs vary | ✓ IP66 test certified · multi-mode shipping reports | ✓ DO-160 aviation tested · drop tested |
| Regional cert pack | ~ Vendor-locked cloud · premium kits | ✓ One-stop · GSP global · GxP/IQ-OQ-PQ in selected countries | ✓ One-stop · GSP global · GxP/IQ-OQ-PQ in selected countries |
How it works
From sensor to audit report — in four steps.
1
Place & activate
Mount in your refrigerator, freezer, or shipment. Long-press to power on, no setup tools required.
2
Continuous logging
Configurable sampling and upload intervals. Internal probe + external PT100/NTC/humidity options.
3
Real-time upload
4G streams to zTMS Cloud with LBS location. Local buffer holds data through signal outages.
4
Alert & report
Local sound + light alarm fires instantly. PDF report exports via USB or Bluetooth printer on demand.
Specifications
| Model | ZKS-S6K |
|---|---|
| Display | 2-inch TFT color screen |
| On-device controls | 4 buttons — Power, Menu, Up, Down |
| On-device menu functions | System info · Start record · Bluetooth print · Alarm log · Advanced ops · Airplane mode · Restart · Shutdown |
| On-device PDF + USB export | ✓ Auto-generated per recording session · USB export |
| Bluetooth printer pairing | ✓ External Bluetooth printer for on-site paper records |
| On-device alarm log | Last 10 alarms viewable |
| Storage capacity | 60,000 readings |
| Internal sensor | Built-in temperature + humidity |
| External probe options | NTC · Temp + humidity · PT100 · customizable O₂ / vibration / light |
| External probe channels | External probe port |
| Additional built-in event sensors | — |
| NTC operating range | −40°C to +80°C |
| PT100 cryogenic operating range | −200°C to +150°C |
| Temperature accuracy | Engineering to confirm specific accuracy band |
| Humidity accuracy | Engineering to confirm |
| Local alarm | Sound + light · over-temp, power loss, low battery (red LED blinks every 5s when battery <20%) |
| Cellular | 4G — LTE-FDD, LTE-TDD, GSM |
| WiFi | — |
| Bluetooth | Pairs with external Bluetooth printer |
| Location | LBS · uploaded with each reading |
| SIM | — |
| Cloud platform | ZKS Cold Cloud / zTMS · REST API · webhooks |
| Cloud alarms | Cloud push + App + WeChat mini-program + SMS + voice call |
| Offline buffer | Local buffer · auto-upload on reconnect |
| Battery | Large-capacity rechargeable lithium |
| Operating duration | Up to 30 days continuous use |
| Standby current | ≤100 µA |
| Charging | USB · DC 5V / 1A |
| Low-battery behavior | Red LED blinks every 5s when <20% · cloud platform low-battery push |
| IP rating | IP66 — test certified (2025-09-15) |
| Mounting | Mobile + fixed |
| Storage temperature | −40°C to +65°C |
| Working temperature | −10°C to +55°C (engineering to confirm low-temp variant) |
| CE marking (EU) | — Engineering roadmap |
| FCC certification (US) | — Engineering roadmap |
| RoHS (EU) | — Engineering roadmap |
| China 3C / CCC | — Not in current registry |
| Explosion-proof certification | — |
| GSP compliance | ✓ Meets national pharmaceutical GSP requirements |
| 21 CFR Part 11 / EU Annex 11 design alignment | ✓ Designed around electronic-records principles |
| ISO 17025 traceable calibration | Available via our validation service |
| IQ / OQ / PQ validation | One-stop service — available in selected countries · scoped per customer environment · confirm coverage with our team |
Where the S6K is deployed
Where the operator owns the record.
Blood station + hospital
Blood transport with paper handover
Drivers and recipients can review the trip on the device, print a signed receipt at handover via Bluetooth, and export the PDF for the donation record. 4G upload keeps the cloud platform synchronized for the facility lead.
Refrigerated vehicle
In-cab logger with on-device control
The 2-inch color screen + 4-button keypad lets the driver start and stop a recording, check alarms, switch to airplane mode in the depot, and reboot — without an app. PDF prints to a paired Bluetooth printer at unload.
Drug store + dispensary
GSP audit station
Pharmacist can pull last 10 alarms and max/min temps on-screen, hand the inspector a printed report on the spot, and back the record up with the cloud platform — no laptop required at the cabinet.
Validation service
GSP confirmed. GxP, IQ, OQ, PQ — scoped to your environment.
ZKSCool operates a one-stop validation service. Standard scope is GSP. International scope (GxP, IQ/OQ/PQ aligned with EU GMP Annex 15 and US FDA expectations) is built per customer environment by our validation team in partnership with your QA leads. Talk to us about your jurisdiction, regulatory framework, and validation timeline.
✓ GSP — confirmed since 2022
✓ GxP scoped to customer environment
✓ IQ / OQ / PQ documentation packages
✓ Calibration certificate (traceable)
✓ Recalibration program
Frequently asked
Questions buyers screen for.
The S6K pairs with an external Bluetooth printer. From the device menu, select Bluetooth Print, confirm the paired printer, and the data record prints on-site. This keeps the logger compact and lets you choose the printer that fits your form factor (counter, vehicle dash, mobile).
Yes. The S6K logs continuously to internal memory, generates the PDF on the device, prints to a paired Bluetooth printer, and exports via USB — all without 4G or WiFi. When 4G returns, the cloud platform syncs automatically.
Yes. The 2-inch TFT color screen shows live temperature, humidity (if humidity probe attached), battery, signal, alarm status, and time. The on-device menu lets the operator view the last 10 alarms, the most recent recording session’s start/end and max/min temperatures, device ID, software version, and untransferred/recorded data counts — all from the keypad.
Built-in temp + humidity sensor. External probe options: NTC temperature, temperature + humidity, and PT100 cryogenic (−200°C to +150°C). For specific environments — pharma manufacturing, sample shippers, blood transport — we can also specify oxygen, vibration, or light sensors.
IP66 — waterproof, shock-resistant, collision-resistant. Suitable for refrigerated vehicles, outdoor loading zones, cold storage, and field deployment. The USB port is sealed with a paired rubber plug.
Yes. The S6K meets national pharmaceutical GSP requirements. Our one-stop validation service can scope the appropriate qualification documentation (GSP, GxP, IQ/OQ/PQ) to match your environment — talk to our team about which protocols apply to your deployment.
CE marking (EU), FCC certification (US), RoHS (EU), and China 3C / CCC. Documentation packs available on request.
Both support PT100 cryogenic, IP66, GSP, 4G + LBS, and 30-day battery life. The S6K is built around the operator — 2-inch TFT color screen, 4-button keypad, full on-device menu, on-device PDF generation with USB export, and Bluetooth printer pairing for on-site paper records. The S6SA is built around embedded sensing — 1.3-inch OLED, built-in door magnetic + light + vibration sensors, BLE 4.0, app/SMS/voice alarm channels. Pick S6K when the workflow happens at the device; pick S6SA when the workflow happens on the cloud.
The S20 is the compact transport-focused logger — 2-inch LCD, IP65, 4,000 mAh / 15-day battery, sound + light alarm only — built to ride inside cartons and vehicles. The S6K adds a color TFT screen, 4-button on-device menu, on-device PDF and Bluetooth print, customizable sensor options, IP66, and 30-day battery — built for the operator at the cabinet or counter.
Yes. zTMS exposes a REST API and webhook events for integration with SAP, Oracle, and major QMS platforms. Custom connector development is available through our engineering team.
Direct technical support from our San Francisco team (North America) and partner network across Europe. Headquarters and engineering in Shenzhen serve our Asia-Pacific customers directly.
Ready to put the S6K in your operators’ hands?
Reply within 1 business day · Sample units available · Validation scope on request