Milesight EM300-TH: IP67 LoRaWAN® temperature & humidity sensing for real-world sites

Need accurate temperature and humidity data you can trust — indoors or outdoors — without wiring or Wi-Fi? The Milesight EM300-TH delivers Sensirion-grade accuracy, IP67 ruggedness and multi-year battery life, sending readings over LoRaWAN® for long-range, low-cost coverage. It’s the go-to sensor for cold-chain, plant rooms, warehouses, greenhouses and compliance monitoring. resource.milesight.com+1

Why UK engineers choose EM300-TH

• Accurate, stable sensing: built-in Sensirion chip; temperature –30…+70 °C (typ. ±0.3 °C in 0–70 °C) and humidity 0–100 % RH (typ. ±3 % in 10–90 % RH @ 25 °C). resource.milesight.com

• Install anywhere: IP67 UV-resistant enclosure; wall, tape or cable-tie mount for cabinets, fridges, outdoor boxes and sheds. resource.milesight.com+1

• Set & forget power: 4,000 mAh replaceable cell (optional 8,000 mAh). Typical life >10 years at SF7 EU868; about 5.8 years at SF10. resource.milesight.com

• Long-range radio: LoRaWAN® Class A with up to 10 km line-of-sight; works with standard gateways (EU868 for UK). resource.milesight.com+1

• Fast commissioning & resilience: NFC tap-to-configure, on-device data storage (2,800 entries) and retransmission so you don’t lose readings. Optional Milesight D2D for ultra-low-latency local control. resource.milesight.com+1

Buy in the UK: Order the EM300-TH Temperature & Humidity Sensor from INDIOTT — see live pricing and delivery on the product page. Indiott

Key specifications at a glance

• Temperature: –30…+70 °C; typ. ±0.6 °C (–30…0 °C), ±0.3 °C (0…70 °C); 0.1 °C resolution

• Humidity: 0–100 % RH; typ. ±3 % (10–90 % @ 25 °C); 0.5 % resolution

• Enclosure: IP67; ABS+PC, UV-resistant; 88.5×85.3×27 mm, ~95.6 g

• Power: 1× 4,000 mAh ER18505 (8,000 mAh optional)

• Radio: LoRaWAN® Class A (EU868/others); internal antenna; –137 dBm sensitivity; 16 dBm TX (EU868)

• Extras: NFC config, D2D, 2,800-sample local storage + retransmission, threshold alarms

• Approvals: CE, EN12830 (cold-chain), FCC, RCM and more
  (See the datasheet for full details.) resource.milesight.com

Best-fit UK applications (and how to deploy fast)

1) Cold-rooms, fridges & freezers (EN12830)

Log temperature automatically for audits. Use thresholds for SMS/email alerts if a door’s left open or a unit fails. The IP67 body shrugs off condensation; battery lasts years. resource.milesight.com

2) Plant rooms & BMS optimisation

Track temp/RH to tune HVAC schedules and spot humidity spikes that lead to mould or corrosion. Store-and-forward prevents gaps during network outages. resource.milesight.com

3) Warehouses, museums & archives

Place sensors across zones to spot hotspots and over-humid areas that threaten goods or collections.

4) Greenhouses & agriculture

Measure canopy conditions where Wi-Fi won’t reach. LoRaWAN® range and IP67 make outdoor placements easy. resource.milesight.com

Quick deployment checklist

1. Network: Join via OTAA on EU868; set suitable DR/SF for coverage vs. battery life. resource.milesight.com

2. Mounting: Use screws/tape inside cabinets or cable-tie to mesh shelves/poles; avoid direct radiant heat. resource.milesight.com

3. Intervals & thresholds: Start with 5–10-minute uplinks; enable threshold alarms for high/low temp/RH. resource.milesight.com

4. Resilience: Turn on local storage + retransmission to protect data during gateway or backhaul issues. resource.milesight.com

5. Fast setup: Use NFC (Milesight ToolBox) to clone settings across multiple units. resource.milesight.com

Frequently asked questions

How long will the battery last?
Over 10 years at SF7 EU868 with a 10-minute interval (about 5.8 years at SF10). The cell is replaceable; an 8,000 mAh version is available. resource.milesight.com

Is it waterproof?
Yes — IP67 enclosure, UV-resistant for harsh environments. resource.milesight.com

What accuracy can I expect?
Typical ±0.3 °C (0–70 °C) and ±3 % RH (10–90 % @ 25 °C). resource.milesight.com

Where can I buy it in the UK?
From INDIOTT — see the EM300-TH product page for price and lead time. Indiott