Temperature & humidity sensor Milesight EM300TH915M

The Milesight EM300TH915M Temperature & humidity sensor is a freestanding device for indoor and outdoor climate monitoring. It measures 88 mm × 87 mm × 27 mm and is designed for compact placement where continuous temperature and humidity tracking is required. The sensor uses a high-sensitivity sensing element that delivers precise readings across a wide temperature range and supports up to five years of battery life with a 4000 mAh cell. The enclosure is rated IP67 for protection against dust and temporary immersion in water, and the unit stores up to 2800 historical data records to support traceability.

Advantages

The EM300TH915M provides high measurement accuracy with ±0.3 °C temperature and ±3% RH humidity performance, using a Sensirion sensing module. Its IP67 waterproof enclosure allows use in challenging environments while preserving sensor reliability. Local data storage of 2800 records ensures historical information remains available and cannot be manually deleted, improving data integrity. Built-in retransmission support helps maintain reliable communication to a web server even when network interruptions occur. NFC-based on/off switching and configuration simplify setup from a mobile phone or PC.

Suitable for

• Indoor climate monitoring in offices, server rooms and warehouses
• Outdoor environmental monitoring under sheltered or exposed installations
• Cold chain monitoring for storage areas sensitive to temperature and humidity
• Industrial and agricultural environments requiring durable, waterproof sensors
• Applications needing locally stored historical records for traceability

Key specifications

• Measurement ranges: -30 °C to 70 °C; 0% to 100% RH
• Accuracy: ±0.3 °C (temperature); ±3% RH (humidity)
• Power: 4000 mAh battery with up to 5 years typical life
• Housing protection: IP67
• Dimensions: 88 mm (W) × 87 mm (D) × 27 mm (H)
• Local data storage: up to 2800 historical records
• Communication features: retransmission support for reliable data delivery
• Type: Freestanding sensor with NFC-based configuration

How to use

Place the EM300TH915M on a stable surface or mount it in a sheltered outdoor location where the sensor element is exposed to the ambient air but protected from direct water jets when possible. Power the device with the internal 4000 mAh battery and configure device parameters using NFC from a compatible mobile phone or PC, following the manufacturer interface for reporting intervals and thresholds. Ensure the device is within radio range of your network gateway for regular data uploads; the unit will store readings locally when connectivity is lost and retransmit them when the link is restored.

Recommendations

For accurate and long-term measurements, avoid placing the sensor in direct sunlight or immediately adjacent to heat sources. If installed outdoors, use a location that provides ventilation but limits direct exposure to rain and snow despite the IP67 rating. Periodically verify recorded data and battery status through your management platform to ensure continuous operation and plan battery replacement before the expected end of life.