Ultralight trail sensor
An ultralight precision sensor for temperature, humidity, and pressure. Built for hikers who want instant trail context.
No spam. Just progress updates and early access invites.
Choose your Thermio
Same precision sensors. Choose a display for instant checks, or go lighter without one.
Thermio
Instant readings on a reflective display. Full graphs and export in the companion app.
- Temperature, humidity, pressure
- Daily min/max + 3-hour pressure trend
- Sunlight-readable LCD
- Gorilla Glass protection
- BLE sync to the companion app for graphs + export
- Extreme-condition notifications (when phone is connected)
- 11 g weight target
Best for: thru-hikers, guides, and anyone who checks conditions constantly
I want Thermio
Thermio Mini
The ultralight logger. Record conditions all day and review them in the app.
- Temperature, humidity, pressure
- Smaller and lighter than Thermio
- Long-life logging
- BLE sync to the companion app for graphs + export
- Extreme-condition notifications (when phone is connected)
- No on-device display
- 8 g weight target
Best for: minimalists, fastpackers, and anyone who wants to log conditions all day
I want Thermio Mini
Minimal outside. Precision sensors inside.
Specs (targets)
We're building a tiny precision sensor that survives real trail abuse.
| Temperature | ±0.1 °C typical (sensor spec), –30…+60 °C operating target |
| Humidity | ±0.5 %RH typical (sensor spec) |
| Pressure | ±0.5 hPa absolute (sensor spec) |
| Logging | 1-minute default target (configurable) |
| Battery | CR2032; 6+ months target |
| Water resistance | IP66 target |
| Display (Thermio) | 1.28" reflective memory LCD + bonded Gorilla Glass protection |
| Connectivity | BLE sync with the companion app |
Thermio is in active development. Final values may change during validation and certification.
Built for decision-making
Not just numbers. Context you can use.
Sun-readable at a glance
A reflective display that stays readable in bright sun. No need to check your phone.
Min/Max values
See today's extremes instantly. Useful for sleep systems, layers, and planning.
Pressure trend + storm icon
A 3-hour trend helps you spot fast weather shifts sooner.
Notifications
Get alerts for extreme conditions when your phone is connected. Set thresholds for heat, cold, wet weather, storm trend, and more.
Heat index + wet-bulb
Heat index and wet-bulb temperature add context in hot, humid conditions.
App graphs + CSV export
View full graphs in the app or export your data for your own analysis.
Your data, in your pocket
The free Thermio companion app gives you full control over your sensor data.
Connect via Bluetooth to view live readings, browse historical trends, set custom alerts, and export your data.
- Live temperature, humidity & pressure readings
- Interactive graphs with full history
- Custom alerts for extreme conditions
- CSV export for your own analysis
Made for the trail.
Lightweight and durable. Designed to be clipped, packed, and trusted in real conditions.
- Water-resistance target for rain, splashes, and dunking
- Fast checks now, detailed logs later
- Built to work in sun, wind, and cold mornings
Roadmap
We're moving fast and validating carefully.
Nov 2025
Proof of Concept
Sensors + BLE baseline validated.
Dec 2025
Field units
Cold + dunk tests. Sensor verification.
Apr 2026
Beta field program
Week-long trail sections. Reliability tuning.
July 2026
Certifications
FCC/CE prep and validation.
2026
Preorders
Opening once beta metrics look solid.
Nov 2025
Proof of Concept
Sensors + BLE baseline validated.
Dec 2025
Field units
Cold + dunk tests. Sensor verification.
Apr 2026
Beta field program
Week-long trail sections. Reliability tuning.
July 2026
Certifications
FCC/CE prep and validation.
2026
Preorders
Opening once beta metrics look solid.
Join the waitlist
Get early access pricing and first invites to field units.