Compatible Add-On Sensor

Expand your ThermoPro 915MHz indoor/outdoor thermometer system with this additional wireless sensor. Please note: this is an accessory only and cannot function independently. Before purchasing, double-check the model and frequency of your existing unit to ensure compatibility.

Long-Range Wireless Coverage

Enjoy reliable monitoring up to 500 feet (150 meters) away with strong signal penetration. Perfect for keeping tabs on temperature and humidity in hard-to-reach areas like garages, basements, greenhouses, or outdoor sheds.

Accurate Temperature & Humidity Readings

Monitor your environment with confidence thanks to a wide temperature range of -4°F to 158°F (-20°C to 70°C) and a ±2°F accuracy. Humidity readings cover 10% to 99% RH, with ±2–3% accuracy, ensuring precise data for your comfort or climate-sensitive storage.

Track Up to 4 Zones Simultaneously

Connect up to 4 total sensors to your base station for multi-zone monitoring. This unit defaults to Channel 1—be sure to set the proper channel using the slider switch on the back when adding additional sensors.

Flexible Placement, Instant Setup

Whether on a tabletop or mounted to a wall, this sensor fits your space. It’s powered by 2 AAA batteries (included) and is ready to go right out of the box, giving you instant expansion with zero hassle.